Case Analysis With Regard To Significant Sukuk Defaults

Yıl 2024, , 16 - 41, 30.06.2024

Nurullah Tırman , İbrahim Keçeci

https://doi.org/10.58686/marufiktisat.1440420

Öz

Sukuk, the most popular instrument of the Islamic capital markets, is defined as the securitization of an asset or a project that offers economic value within the framework of Islamic finance contracts. Sukuk holders earn income based on trading (murabaha), leasing (ijarah), management agreement (al-wakala bi'l-istismar), realization of a project with a joint venture (mudarabah/musharakah), or production through forward manufacturing (istisna/salam) contracts. Securitized from different contract structures in accordance with Shariah principles, sukuk can be structured as asset-based and/or asset-backed. Although there is an underlying asset behind the issuance of sukuk, it still carries various financial risks. In addition to the risks of existing securities in the financial system, such as the risks arising from the originator, investor and the market, sukuk is exposed to additional risks such as the problem of Shariah compliance in line with the principles of Islamic finance, and insufficient legal infrastructure. In this study, by considering the risks related to sukuk, nine important case examples that have defaulted as a result of the realization of sukuk risks and have been examined and analyzed. The default cases in the examined emerged when the originator could not meet their obligations to sukuk investors on time due to problems arising from their commercial, financial and/or external factors.

Anahtar Kelimeler

sukuk, sukuk risks, default, sukuk defaults, sukuk cases

Temerrüde Düşen Önemli Sukuk İhraçlarına İlişkin Vaka Analizi

Öz

İslami sermaye piyasasının en önemli enstrümanı olarak görülen sukuk, iktisadi değer sunan bir varlık veya projenin İslami finans sözleşmeleri çerçevesinde menkul kıymetleştirilmesi olarak tanımlanmaktadır. Sukuk sahipleri, menkul kıymetleştirilen varlıklar üzerinden alım-satıma (murabaha), kiralamaya (icâre), vekâlet yoluyla yönetime (el-vekâle bi’l-istismar), ortak girişim (mudârebe/müşâreke) ile bir projenin hayata geçirilmesine veya vadeli üretim sözleşmeleri üzerinden üretime (istisnâ/selem) dayalı olarak gelir elde edebilmektedir. İslami finans prensiplerine uyumlu olarak farklı sözleşme yapıları üzerinden menkul kıymetleştirilen sukuk, varlık-temelli (asset-based) ve/veya varlığa-dayalı (asset-backed) olarak yapılandırılabilmektedir. Sukuk ihracının arkasında dayanak bir varlık bulunsa da çeşitli finansal risklere maruz kalmaktadır. Sukuk; kaynak kuruluş, yatırımcı ve piyasa yapısından kaynaklanan riskler gibi konvansiyonel finansal sistemdeki mevcut menkul kıymetlerin sahip olduğu risklerin yanı sıra İslami finans esasları doğrultusunda fıkhî uyum sorunu, hukuki altyapının yetersiz olması gibi ilave risklere de maruz kalmaktadır. Bu çalışmada, sukuka ilişkin riskler ele alınarak, bu risklerin gerçekleşmesi sonucunda temerrüde düşen ve sukuk piyasasında yankı uyandıran dokuz farklı vaka örneği incelenmiş ve analiz edilmiştir. İncelenen vakalardaki temerrüt durumları, kaynak kuruluşların ticari, mali ve/veya dış faktörlerden kaynaklı problemler nedeniyle, sukuk yatırımcılarına olan yükümlülüklerini tam olarak karşılayamaması ya da zamanında karşılayamaması durumunda ortaya çıkmıştır.

Anahtar Kelimeler

sukuk, sukuka ilişkin riskler, temerrüt, sukuk temerrüdü, sukuk vakaları

Kaynakça

• AAOIFI. (2015). Faizsiz Finans Standartları. İstanbul: TKBB Yayınları.
• Ahmed, M. (2015). Islamic Project Finance: A Case Study of the East Cameron Project. The Journal of Structured Finance, 20(4), 120–135. doi:10.3905/jsf.2015.20.4.120
• Aktepe, İ. E. (2013). Sorularla Katılım Bankacılığı. İstanbul: TKBB Yayınları.
• Al Ali, S. (2019). Raising Capital on Sukuk Markets: Structural, Legal and Regulatory Issues. Cham: Palgrave Macmillan. doi:10.1007/978-3-030-14536-1
• Al Amine, M. A.-B. M. (2012). Global Sukuk and Islamic Securitization Market: Financial Engineering and Product Innovation. (E. Cotran, M. Hoyle ve M. Lau, Ed.). Leiden: BRILL.
• Al Mahmoud, H., Bakhsh, M. ve Aref, S. (2017). Sukuk defaults – Country wise analysis. Islamic Finance Expert. https://ifinanceexpert.wordpress.com/2017/08/17/sukuk-defaults-country-wise-analysis/ adresinden erişildi.
• Al Sayed, O. (2013). Sukuk Risk: Analysis and Manage. European Journal of Applied Social Sciences Research, 1(3), 67–76. https://www.researchgate.net/publication/285925521_Sukuk_Risk_Analysis_and_Management adresinden erişildi.
• Al Sayegh, H. ve Torchia, A. (2016). Dubai’s Nakheel says has finished $16 billion recovery from crisi. Reuters. https://www.reuters.com/article/nakheel-develop-restructuring-idIND5N17S01H/ adresinden erişildi.
• Alam, N., Bhatti, M. ve Wong, J. T. F. (2018). Assessing Sukuk Defaults Using Value-at-Risk Techniques. Managerial Finance, 44(6), 665–687. doi:10.1108/MF-05-2018-0218
• Aldred, S., Yuniarni, S. ve Wee, R. (2022). Garuda CEO Says 19% Recovery Rate for $500M Sukuks Due 2023, Lessors, Carrier Plans to Cut Fleet to 66 Aircraft; Certain Lessors Place Claims in PKPU as Company Proposes New Agreements to Overwrite Existing Contracts for Lessors to Enter UK Scheme of Arra. Reorg. https://reorg.com/garuda-sukuks-due-2023/ adresinden erişildi.
• Alfan, E. (2012). Public-Private Partnership (PPP) Projects for Malaysian Tolled Highways - An Insight Using A Political Economy Approach. Journal of Accounting Perspectives, 5(1), 59–74. doi:https://doi.org/10.22452/AJAP.vol5no1.5
• Alswaidan, M. W., Daynes, A. ve Pasgas, P. (2017). Understanding and Evaluation of Risk in Sukuk Structures. Journal of Islamic Accounting and Business Research, 8(4), 389–405. doi:10.1108/JIABR-05-2015-0021
• Archer, S. ve Abdel Karim, R. A. (2018). Islamic Capital Markets and Products. Chichester: John Wiley & Sons.
• Bacha, O. I. ve Mirakhor, A. (2013). Islamic Capital Markets: A Comparative Approach. Singapore: John Wiley & Sons.
• Barbuscia, D. (2017). UAE’s Dana Gas leaves maturing sukuk unpaid but no default declared. Reuters. https://www.reuters.com/article/dana-gas-sukuk-idUSL8N1N60IT adresinden erişildi.
• Barbuscia, D. ve Torchia, A. (2017). UK court finds for Dana Gas creditors in $700 million Islamic bond case. Reuters. https://www.reuters.com/article/uk-dana-gas-sukuk-idUKKBN1DH1BY adresinden erişildi.
• Bayındır, S. (2015). Fıkhi ve İktisadi Açıdan İslami Finans - II (Para ve Sermaye Piyasaları). İstanbul: Süleymaniye Vakfı Yayınları.
• Brier, J. (2018). Bank held to owe duty of care to secondary market bondholders in “Golden Belt” Islamic bond case. Essex Court Chambers. https://essexcourt.com/wp-content/uploads/2018/05/Golden-Belt.pdf adresinden erişildi.
• Busari, S. A. (2019). Juristic Analysis of Ṣukūk Default: East Cameron Gas United States of America. Al-Hikmah: International Journal of Islamic Studies and Human Sciences, 2(1), 109–127. doi:10.46722/hikmah.v2i1.12
• Busari, S. A., AbdulAziz, A., Zakariyah, L. ve Muhammad, A. (2019). Dana Gas Sukuk default: a juristic analysis of court judgement. International Journal of Islamic and Middle Eastern Finance and Management, 12(4), 569–585. doi:10.1108/IMEFM-01-2019-0033
• CBFO. (2022). Katılım Finans Strateji Belgesi: Bütüncül Dönüşüm (2022-2025). T.C. Cumhurbaşkanlığı Finans Ofisi. https://www.cbfo.gov.tr/sites/default/files/2022-10/cumhurbaskanligi-finans-ofisi-katilim-finans-strateji-belgesi.pdf adresinden erişildi.
• Dana Gas. (2019). Dana Gas bought back $133 million Sukuk and seeks approval at General Meeting for a 5.5 fils dividend and Shares buyback program. BAE: Dana Gas. https://www.danagas.com/wp-content/uploads/2019/06/20190314-Sukuk-buy-back-complete-including-SBB-and-Dividend-En.pdf adresinden erişildi.
• El Gamal, R. (2009). Kuwait’s Dar Defaults on $100 mln Sukuk. Reuters. https://www.reuters.com/article/dar-sukuk-idUSLC28153620090512 adresinden erişildi.
• Essayem, A. ve Özdemir, M. (2021). Sukuk Piyasasında Çözümü Güç Bir Mesele: Dana Gas Sukuk. Finansal Vaka Analizleri: Vakalarla Bankacılık içinde (ss. 249–269). Ankara: Nobel Akademik Yayıncılık.
• Fitch Ratings. (2019a). Fitch Assigns Serba Dinamik’s USD300 Million Sukuk Final “BB-” Rating. https://www.fitchratings.com/research/corporate-finance/fitch-assigns-serba-dinamik-usd300-million-sukuk-final-bb-rating-09-05-2019 adresinden erişildi.
• Fitch Ratings. (2019b). Fitch Assigns Serba Dinamik’s USD200m Sukuk Final “BB-” Rating. https://www.fitchratings.com/research/corporate-finance/fitch-assigns-serba-dinamik-usd200m-sukuk-final-bb-rating-23-12-2019 adresinden erişildi.
• GIA. (2021). About Garuda Indonesia. Garuda Indonesia. https://www.garuda-indonesia.com/other-countries/en/corporate-partners/company-profile/about/index adresinden erişildi.
• GIA. (2022). Annual Report. Garuda City, Indonesia: Garuda Indonesia. https://www.garuda-indonesia.com/content/dam/garuda/hubungan-investor/20230612 AR GARUDA 2022 - FULL.pdf adresinden erişildi.
• Goni, A. (2017). UAE: Young, Yet Growing Islamic Capital Markets. Islamic Commercial Law Report 2017 içinde (ss. 114–116). ISRA & Thomson Reuters. https://ceif.iba.edu.pk/pdf/ThomsonReuters-IslamicCommercialLawReport2017.pdf adresinden erişildi.
• Haider, J. ve Azhar, M. (2010). Islamic Capital Market: Sukuk and Its Risk Management in the Current Scenario. Master Thesis: School of Business, UMEA University.
• Hall, C. (2012). UAE’s first sukuk restructuring forecast. Financial Times. https://www.ft.com/content/88633a8c-9f48-11e1-a455-00144feabdc0 adresinden erişildi.
• Hall, C. (2013). The Investment Dar: Creditors stand by for “problem child” payment. Financial Times. https://www.ft.com/content/dec383a6-a80b-11e2-b031-00144feabdc0 adresinden erişildi.
• Haroon, O., Meenai, S. F. ve Rizvi, A. R. (2020). Dana Gas: The Sukuk Dispute. Asian Journal of Management Cases, 17, 42–54. doi:10.1177/0972820119884395
• Hasan, R., Ahmad, A. U. F. ve Parveen, T. (2019). Sukuk Risks - A Structured Review of Theoretical Research. Journal of Islamic Accounting and Business Research, 10(1), 35–49. doi:10.1108/JIABR-06-2015-0026
• Huntriss, F. ve Kelley, M. (2018). Golden Belt 1 Sukuk Co BSC(c) v BNP Paribas: A Golden Opportunity for Secondary Purchasers of Debt? Ramifications for the Secondary Debt Market and Arrangements of Capital Market Transactions. Journal of International Banking Law and Regulations, 6, 213–216. https://www.bsfllp.com/images/content/3/2/v6/3202/A-Golden-Opportunity-for-Secondary-Purchasers-of-Debt-JIBLR.pdf adresinden erişildi.
• IFF. (2020). Sukuk That Went Bust. Islamic Finance Foundation. https://www.islamicfinance.com/2020/08/sukuk-went-bust/#/?playlistId=0&videoId=0 adresinden erişildi.
• IFN. (2007). SunInfra Awaiting Approval. Islamic Finance News. https://islamicfinancenews.com/sites/default/files/newsletters/v4i48.pdf adresinden erişildi.
• IFN. (2018). Dana Gas reaches agreement. Islamic Finance News. Dana Gas reaches agreement adresinden erişildi.
• IFSB. (2009). IFSB Standard 7: Capital Adequacy Requirements for Sukuk, Securitisations and Real Estate Investments. Kuala Lumpur, Malaysia: Islamic Financial Services Board. https://www.ifsb.org/published.php adresinden erişildi.
• IFSB. (2017). IFSB Standard 19: Guiding Principles on Disclosure Requirements for Islamic Capital Market Products (Sukûk and Islamic Collective Investment Schemes). Kuala Lumpur, Malaysia: Islamic Financial Services Board. https://www.ifsb.org/published.php adresinden erişildi.
• IFSB. (2022). Islamic Financial Services Industry Stability Report 2022. Kuala Lumpur, Malaysia: Islamic Financial Services Board. https://www.ifsb.org/sec03.php adresinden erişildi.
• IIFA. (1988). Resolution No. 30 (5/4) Muqāraḍah and Investment Certificates. Jeddah: The Council of the International Islamic Fiqh Academy of the Organization of the Islamic Conference. https://iifa-aifi.org/en/1713.html adresinden erişildi.
• IIFM. (2023). Sukuk Report: A Comprehensive Study of the Global Sukuk Market. Manama, Kingdom of Bahrain: International Islamic Financial Markets. https://www.iifm.net/frontend/general-documents/f0a12d4a6880f8e3bc23a23a03baa8e61693983390.pdf adresinden erişildi.
• InfraPPP. (2014). Bond holders approve sale of highway concession in Malaysia. https://www.infrapppworld.com/news/bond-holders-approve-sale-of-highway-concession-in-malaysia adresinden erişildi.
• Jalil, A. (2021). Default sukuk payment will affect Serba Dinamik’s performance. The Malaysian Reserve. https://themalaysianreserve.com/2021/12/16/default-sukuk-payment-will-affect-serba-dinamiks-performance/ adresinden erişildi.
• JCorp. (2008). Annual Report 2008. Johor, Malaysia. https://jcorp.com.my/wp-content/uploads/2020/10/annual-2008-1.pdf adresinden erişildi.
• JCorp. (2012). Annual Report 2012. Johor, Malaysia. https://jcorp.com.my/wp-content/uploads/2020/10/2012-EngVer1-1.pdf adresinden erişildi.
• JCorp. (2023). Where It All Began. JCorp Journey. https://jcorp.com.my/who-we-are-our-history/ adresinden erişildi.
• Kamarudin, M. F., Kamaluddin, N., Ab. Manan, S. K. ve Mat Ghani, G. (2014). Defaulters profile in Malaysia Sukuk market. Procedia Social and Behavioral Sciences, 277–285. doi:10.1016/j.sbspro.2014.06.035 Karam, S. (2009). Saudi Saad nears debt restructuring. Reuters. https://www.reuters.com/article/saad-accounts-idUSL714950720090607 adresinden erişildi.
• Kazancı, F. (2023). Sukuk Türlerinin İkincil Piyasalarda İşlem Görebilmesi ve Borç Satışı Yasağına Göre Analizi. Adam Akademi Sosyal Bilimler Dergisi, 13(2), 331–359. doi:10.31679/adamakademi.1019069 Khan, T. ve Ahmed, H. (2001). Risk Management: An Analysis of Issues in Islamic Financial Industry. Jeddah: Islamic Research and Training Institute.
• Latham & Watkins. (2011). Case Study-East Cameron Partners Sukuk. Policy Brief on Corporate Governance for Islamic Banks and Financial Institutions in the Middle East and North Africa Region içinde . Dubai: HAWKAMAH Institute for Corporate Governance. https://zenodo.org/records/3550938 adresinden erişildi.
• Latham & Watkins. (2015). The Sukuk Handbook: A Guide to Structuring Sukuk. Latham & Watkins LLP. https://www.islamicfinance.com/wp-content/uploads/2015/06/Guide-to-structurings-sukuk-2015.pdf adresinden erişildi.
• Lim, B. S. (2017). Trade Wise: A better chance for SILK this time round. The Edge Malaysia. https://theedgemalaysia.com/article/trade-wise-better-chance-silk-time-round adresinden erişildi.
• Majid, H. A., Shahimi, S. ve Abdullah, M. H. S. B. (2011). Sukuk Defaults and Its Implication: A Case Study of Malaysian Capital Market. 8th International Conference on Islamic Economics and Finance içinde . Doha. http://conference.qfis.edu.qa adresinden erişildi.
• Marinescu, I. (2012). Where Does the Dirham Stop in a Sukuk Default. Hasting International and Comparative Law Review, 35, 451–478.
• McMillen, M. J. T. (2016). Critical Factors for Stimulating Private Sector Sukuk Markets. SSRN. https://ssrn.com/abstract=2758297 adresinden erişildi.
• McMillen, M. J. T. (2021). Dokuzuncu Bölüm. İslami Finansın Küresel Önderleri içinde (ss. 255–280). İstanbul: Albaraka Yayınları.
• Moody’s. (2007). Moody’s rates Saad’s Sukuk Issuance (P)Baa1. Moody’s Investors Service. https://www.moodys.com/research/Moodys-rates-Saads-Sukuk-Issuance-PBaa1-Rating-Action--PR_132177 adresinden erişildi.
• Muhamed, N. A. ve Mat Radzi, R. (2011). Implication of Sukuk Structuring: The Comparison on the Structure of Asset Based and Asset Backed Ijarah Sukuk. 2nd International Conference on Business and Economic Research Proceeding içinde . Malaysia: EconPapers. https://econpapers.repec.org/RePEc:cms:2icb11:2011-466 adresinden erişildi.
• Munthe, B. C. ve Suroyo, G. (2021). Airline Garuda Indonesia Defaults on $500 mln Sukuk. Reuters. https://www.reuters.com/business/airline-garuda-indonesia-defaults-500-mln-sukuk-2021-06-18/#:~:text=JAKARTA%2C June 18 (Reuters),impacted by the coronavirus pandemic. adresinden erişildi.
• Nair, D. ve Abocar, A. (2012). UAE’s Dana Gas won’t repay bond. Reuters. https://www.reuters.com/article/us-dana-sukuk-idUSBRE89T10120121030/ adresinden erişildi.
• Nanaeva, Z. K. (2010). How Risk Sukuk Structure Are: Comparative Analysis of Risks Associated with Sukuk and Conventional Bonds. Master Thesis: Finance and Banking, The British University in Dubai. http://bspace.buid.ac.ae/handle/1234/29 adresinden erişildi.
• Obaidullah, M. ve Khan, T. (2008). Islamic Microfinance Development: Challenges and Initiatives. Islamic Research & Training institute Policy Dialogue Paper No. 2. doi:10.2139/ssrn.1506073
• Orhan, Z. H. ve Tırman, N. (2021). Türkiye’deki Kira Sertifikası (Sukuk) İhraçlarının Büyüme Üzerindeki Etkisine Dair Ampirik Bir Analiz: 2010-2019. Sosyoekonomi, 29(48), 229–247. doi:10.17233/sosyoekonomi.2021.02.12
• Othman, Z. ve Kamarudzaman, A. K. (2012). The Great Syariah Debate. RAM Bullettin: Sukuk Focus.
• Pujobroto. (2015). Garuda Indonesia Prices US$ 500 Million 5 Year Sukuk Offering With A Coupon of 5.950%. Garuda Indonesia. https://www.garuda-indonesia.com/uk/en/news-and-events/garuda-indonesia-5years-sukuk adresinden erişildi.
• Radzi, R. M. ve Shaharuddin, A. (2018). The Idealization of Risk-Profit Sharing in Partnership-Based Sukuk (Islamic Bonds): Why Sukuk Are Experiencing Default? International Review of Management & Business Research, 7(3), 633–645. doi:10.30543/7-3(2018)-1
• Raza, K. (2007). Nakheel Pre IPO Sukuk Issue – A Case Study. Dubai Islamic Bank & Milennium Capital. https://www.iefpedia.com/english/wp-content/uploads/2011/02/Nakheel-Pre-IPO-Sukuk-Issue.pdf adresinden erişildi.
• Rosly, S. A. ve Sanusi, M. M. (1999). The Application of Bay’ Al-’Inah and Bay’ Al-Dayn in Malaysian Islamic Bonds: An Islamic Analysis. International Journal of Islamic Financial Services, 1(2). https://iaif.ir/images/khareji/articles/other/59.pdf adresinden erişildi.
• Rsugianto, S., Sridadi, A. R., Aryatie, I. R. ve Ahmad, N. (2020). Dispute Resolution in the Restructuring of Defaulted Sukuk: An Emprical Investigation in Malaysia. International Journal of Innovation, Creativity and Change, 11(11), 617–635. https://www.ijicc.net/images/Vol11Iss11/111126_Rusgianto_2020_E_R.pdf adresinden erişildi.
• Salah, O. (2010). Dubai Debt Crisis: A Legal Analysis of the Nakheel Sukuk. Berkeley Journal of International Law, Publicist (online), 4, 19–32. https://bjil.typepad.com/publicist/2010/02/dubai-debt-crisis-a-legal-analysis-of-the-nakheel-sukuk.html adresinden erişildi.
• Serba Dinamik. (2022). Integrated Report 2021/2022. Serba Dinamik. https://www.insage.com.my/ir/interactiveAR/SERBADK/interactiveAR2022/ adresinden erişildi. Serba Dinamik. (2024). Creditor Engagement Overview. https://www.e-serbadk.com/creditor-engagement-overview/ adresinden erişildi.
• Tariq, A. A. (2004). Managing Financial Risks of Sukuk Structures. Master Thesis: Department of International Banking, Loughborough University. https://d1wqtxts1xzle7.cloudfront.net/30278321/c86-libre.pdf?1390882744=&response-content-disposition=inline%3B+filename%3DManaging_financial_risks_of_sukuk_struct.pdf&Expires=1697466042&Signature=LqpbUftR1~QrN62Ib8vZOZiMibwtiDBuje5O2j9MdnoVqPgLdy0dR4cHij adresinden erişildi.
• Tariq, A. A. ve Dar, H. (2007). Risks of Sukuk Structures: Implications for Resource Mobilization. Thunderbird International Business Review, 49(2), 203–223. doi:10.1002/tie.20140
• TID. (1996). Annual Report 1996. The Investor Dar Company. http://www.inv-dar.com/upload/1_31Oct2012_96_Complete_782.pdf adresinden erişildi.
• Usmani, M. T. (2007). Sukuk and their Contemporary Applications. https://www.iefpedia.com/english/wp-content/uploads/2009/11/Sukuk-and-their-Contemporary-Applications.pdf adresinden erişildi. van Wijnbergen, S. ve Zaheer, S. (2013). Sukuk Defaults: On Distress Resolution in Islamic Finance. Tinbergen Institute Discussion Paper 13-087/VI/DSF57. doi:van Wijnbergen, Sweder and Zaheer, Sajjad, Sukuk Defaults: On Distress Resolution in Islamic Finance (July 8, 2013). Tinbergen Institute Discussion Paper 13-087/VI/DSF57, Available at SSRN: https://ssrn.com/abstract=2293938 or http://dx.doi.org/10.2139/ssrn.2293938
• Yatim, H. (2022). Court allows HSBC to intervene in Serba Dinamik’s debt restructuring scheme. The Edge Malaysia. https://theedgemalaysia.com/article/court-allows-hsbc-intervene-serba-dinamiks-debt-restructuring-scheme adresinden erişildi.
• Zada, N. ve Muhammad, M. (2018). The Intricacies of Default in Islamic Finance: A Case Study of Dana Gas Sukuk Litigation. Journal of Islamic Business and Management, 8(S), 286–292. doi:10.26501/jibm/2018.080S-009
• Zakaria, N. B., Md Isa, M. A. ve Zainal Abidin, R. A. (2012). The Construct of Sukuk, Rating and Default Risk. Procedia Social and Behavioral Sciences, 65, 662–667. doi:10.1016/j.sbspro.2012.11.181
• Zeineldin, H. (2014). East Cameron Gas Sukuk-A Case Study on Sukuk Default. https://www.sukuk.com/wp-content/uploads/2014/04/East-Camerron-Case-Study.pdf adresinden erişildi.