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Onur Sevli Assoc. Prof. Dr. BURDUR MEHMET AKİF ERSOY ÜNİVERSİTESİ
Publication 31 Review 63 CrossRef Cited 105 TR Dizin Cited 45
31 Publication
63 Review
105 CrossRef Cited
45 TR Dizin Cited
0000-0002-8933-8395

Research Fields

Computer Software Information and Computing Sciences Machine Learning Information Security and Cryptology Data Mining and Knowledge Discovery Data Engineering and Data Science Artificial Intelligence Yapay Zeka Yazılım

Institution

BURDUR MEHMET AKİF ERSOY ÜNİVERSİTESİ

Popular Publications

Türkçe Paylaşım Yapan Kullanıcılar İçin Sosyal Ağ Tabanlı Analiz ve Tavsiye Sistemi
Authors: Onur Sevli , Ecir Uğur Küçüksille
Published: 2016 , Academic Platform - Journal of Engineering and Science
DOI: 10.21541/apjes.69981
CITED 2 FAVORITE 3 TOTAL DOWNLOAD COUNT 3726

2

3

3726

Diyabet hastalığının farklı sınıflandırıcılar kullanılarak teşhisi
Authors: Onur Sevli
Published: 2022 , Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi
DOI: 10.17341/gazimmfd.880750
CITED 8 FAVORITE 1 TOTAL DOWNLOAD COUNT 2342

8

1

2342

A Comparative Analysis of Bank Customers' Loan Propensity Using Machine Learning Methods
Authors: Ali Tezcan Sarızeybek , Onur Sevli
Published: 2022 , Journal of Intelligent Systems: Theory and Applications
DOI: 10.38016/jista.1036047
CITED 4 FAVORITE 1 TOTAL DOWNLOAD COUNT 2660

4

1

2660

Determining the Income Distribution Levels of Individuals with Machine Learning Techniques
Authors: Sait Taner Canibey , Onur Sevli
Published: 2022 , Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
DOI: 10.47495/okufbed.1039815
CITED 2 FAVORITE 1 TOTAL DOWNLOAD COUNT 807

2

1

807

Forecasting Solar Radiation Based on Meteorological Data Using Machine Learning Techniques: A Case Study of Isparta
Authors: Buğra Güzel , Onur Sevli , Ersan Okatan
Published: 2023 , International Journal of Engineering Research and Development
DOI: 10.29137/umagd.1268055
CITED 2 FAVORITE 1 TOTAL DOWNLOAD COUNT 1463

2

1

1463

Publications

Time Series Analysis of Solar Energy Production Based on Weather Conditions
Authors: Mehmet Bülüç , Onur Sevli , Lokman Yünlü
Published: 2025 , Gazi University Journal of Science Part A: Engineering and Innovation
DOI: 10.54287/gujsa.1797659
FAVORITE 0 TOTAL DOWNLOAD COUNT 603

0

603

Fazla örnekleme ve az örnekleme ile makine öğrenmesi kullanarak akademik başarının tahmin edilmesine yönelik bir sınıflandırma çalışması
Authors: Ayşe Alkan , Onur Sevli
Published: 2025 , Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi
DOI: 10.17341/gazimmfd.1465283
FAVORITE 0 TOTAL DOWNLOAD COUNT 1065

0

1065

A MACHINE LEARNING-BASED CROP RECOMMENDATION SYSTEM BASED ON AGRO-CLIMATIC CONDITIONS TO ENHANCE AGRICULTURAL PRODUCTIVITY
Authors: Onur Sevli
Published: 2025 , International Journal of Sustainable Engineering and Technology
DOI: 10.62301/usmtd.1702079
FAVORITE 0 TOTAL DOWNLOAD COUNT 436

0

436

Comparison of Different Classifiers Through Feature Selection in The Diagnosis of Autism Spectrum Disorder
Authors: Sinem Koç , Onur Sevli
Published: 2025 , Fırat Üniversitesi Mühendislik Bilimleri Dergisi
DOI: 10.35234/fumbd.1501652
FAVORITE 0 TOTAL DOWNLOAD COUNT 728

0

728

Deep learning based classification for alzheimer's disease detection using MRI images
Authors: Seda Nur Polater , Onur Sevli
Published: 2024 , Turkish Journal of Engineering
DOI: 10.31127/tuje.1434866
FAVORITE 0 TOTAL DOWNLOAD COUNT 1385

0

1385

Wind speed prediction using LSTM and ARIMA time series analysis models: A case study of Gelibolu
Authors: Adem Demirtop , Onur Sevli
Published: 2024 , Turkish Journal of Engineering
DOI: 10.31127/tuje.1431629
FAVORITE 0 TOTAL DOWNLOAD COUNT 2331

0

2331

MACHINE LEARNING BASED STUDENT ACHIEVEMENT PERFORMANCE PREDICTION WEB APPLICATION
Authors: Osman Ceylan , Onur Sevli
Published: 2024 , International Journal of Engineering and Innovative Research
DOI: 10.47933/ijeir.1504555
FAVORITE 1 TOTAL DOWNLOAD COUNT 1109

1

1109

Machine Learning Based Classification for Spam Detection
Authors: Serkan Keskin , Onur Sevli
Published: 2024 , Sakarya University Journal of Science
DOI: 10.16984/saufenbilder.1264476
FAVORITE 0 TOTAL DOWNLOAD COUNT 1573

0

1573

COMPARATİVE ANALYSİS OF THE CLASSİFİCATİON OF RECYCLABLE WASTES
Authors: Serkan Keskin , Onur Sevli , Ersan Okatan
Published: 2023 , Journal of Scientific Reports-A
DOI: 10.59313/jsr-a.1335276
FAVORITE 1 TOTAL DOWNLOAD COUNT 1782

1

1782

A Deep Learning-Based Classification Study for Diagnosing Corneal Ulcers on Ocular Staining Images
Authors: Onur Sevli
Published: 2023 , Acta Infologica
DOI: 10.26650/acin.1173465
FAVORITE 0 TOTAL DOWNLOAD COUNT 516

0

516

A DIGITAL AGRICULTURE APPLICATION ACCORDING TO THE SCALE OF AGRICULTURE 4.0: FARM MONITORING AND MANAGEMENT SYSTEM
Authors: Onur Sevli
Published: 2023 , International Journal of Sustainable Engineering and Technology
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 6396

0

6396

Single and Binary Performance Comparison of Data Compression Algorithms for Text Files
Authors: Serkan Keskin , Onur Sevli , Ersan Okatan
Published: 2023 , Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
DOI: 10.17798/bitlisfen.1301546
FAVORITE 0 TOTAL DOWNLOAD COUNT 675

0

675

Forecasting Solar Radiation Based on Meteorological Data Using Machine Learning Techniques: A Case Study of Isparta
Authors: Buğra Güzel , Onur Sevli , Ersan Okatan
Published: 2023 , International Journal of Engineering Research and Development
DOI: 10.29137/umagd.1268055
FAVORITE 1 TOTAL DOWNLOAD COUNT 1463

1

1463

Examination of Master's Thesis Written in the Field of Artificial Intelligence in Turkey
Authors: Ayşe Alkan , Onur Sevli
Published: 2023 , Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
DOI: 10.47495/okufbed.1062622
FAVORITE 0 TOTAL DOWNLOAD COUNT 3709

0

3709

Machine Learning Detection of Collision-Risk Asteroids
Authors: Ömer Can Eskicioğlu , Ali Hakan Isık , Onur Sevli
Published: 2022 , El-Cezeri
DOI: 10.31202/ecjse.1135651
FAVORITE 0 TOTAL DOWNLOAD COUNT 1002

0

1002

Diyabet hastalığının farklı sınıflandırıcılar kullanılarak teşhisi
Authors: Onur Sevli
Published: 2022 , Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi
DOI: 10.17341/gazimmfd.880750
FAVORITE 1 TOTAL DOWNLOAD COUNT 2342

1

2342

Predicting Traffic Accident Severity Using Machine Learning Techniques
Authors: Ali Çelik , Onur Sevli
Published: 2022 , Turkish Journal of Nature and Science
DOI: 10.46810/tdfd.1136432
FAVORITE 0 TOTAL DOWNLOAD COUNT 4044

0

4044

A Comparative Analysis of Bank Customers' Loan Propensity Using Machine Learning Methods
Authors: Ali Tezcan Sarızeybek , Onur Sevli
Published: 2022 , Journal of Intelligent Systems: Theory and Applications
DOI: 10.38016/jista.1036047
FAVORITE 1 TOTAL DOWNLOAD COUNT 2660

1

2660

A Comparative Study of Heart Disease Diagnosis using Various Classifiers and Resampling Techniques
Authors: Onur Sevli
Published: 2022 , Journal of Intelligent Systems: Theory and Applications
DOI: 10.38016/jista.1069541
FAVORITE 0 TOTAL DOWNLOAD COUNT 1772

0

1772

Predicting acceptance of the bank loan offers by using support vector machines
Authors: Mehmet Furkan Akça , Onur Sevli
Published: 2022 , International Advanced Researches and Engineering Journal
DOI: 10.35860/iarej.1058724
FAVORITE 0 TOTAL DOWNLOAD COUNT 3182

0

3182

Determining the Income Distribution Levels of Individuals with Machine Learning Techniques
Authors: Sait Taner Canibey , Onur Sevli
Published: 2022 , Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
DOI: 10.47495/okufbed.1039815
FAVORITE 1 TOTAL DOWNLOAD COUNT 807

1

807

BREAST CANCER DIAGNOSIS WITH FEATURE SELECTION USING NATURE-INSPIRED OPTIMIZATION AND MACHINE LEARNING
Authors: Onur Sevli
Published: 2022 , Journal of Engineering Sciences and Design
DOI: 10.21923/jesd.1023451
FAVORITE 0 TOTAL DOWNLOAD COUNT 1292

0

1292

PREDICTION OF THE MATERIAL TO BE USED IN 3D PRINTING WITH MACHINE LEARNING TECHNIQUES
Authors: Onur Sevli
Published: 2021 , International Journal of 3D Printing Technologies and Digital Industry
DOI: 10.46519/ij3dptdi.1026694
FAVORITE 0 TOTAL DOWNLOAD COUNT 1640

0

1640

Performance Comparison of Different Pre-Trained Deep Learning Models in Classifying Brain MRI Images
Authors: Onur Sevli
Published: 2021 , Acta Infologica
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 2477

0

2477

Olağandışı Olaylar Hakkındaki Tweet’lerin Gerçek ve Gerçek Dışı Olarak Google BERT Modeli ile Sınıflandırılması
Authors: Onur Sevli , Nazan Kemaloğlu
Published: 2021 , Veri Bilimi
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 1629

0

1629

Turkish sign language digits classification with CNN using different optimizers
Authors: Onur Sevli , Nazan Kemaloğlu
Published: 2020 , International Advanced Researches and Engineering Journal
DOI: 10.35860/iarej.700564
FAVORITE 0 TOTAL DOWNLOAD COUNT 1449

0

1449

Machine Learning Based Case Estimation Using Prophet Model with Time Series Data for Covid-19 Outbreak
Authors: Onur Sevli , Vesile Gül Başer Gülsoy
Published: 2020 , Avrupa Bilim ve Teknoloji Dergisi
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 4200

0

4200

Performance Comparison of Different Machine Learning Techniques in Diagnosis of Breast Cancer
Authors: Onur Sevli
Published: 2019 , Avrupa Bilim ve Teknoloji Dergisi
DOI: 10.31590/ejosat.553549
FAVORITE 0 TOTAL DOWNLOAD COUNT 7620

0

7620

BİLİŞSEL İŞLEM ÜZERİNE BİR İNCELEME
Authors: Onur Sevli , Bekir Aksoy
Published: 2018 , Uluborlu Mesleki Bilimler Dergisi
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 1343

0

1343

Türkçe Paylaşım Yapan Kullanıcılar İçin Sosyal Ağ Tabanlı Analiz ve Tavsiye Sistemi
Authors: Onur Sevli , Ecir Uğur Küçüksille
Published: 2016 , Academic Platform - Journal of Engineering and Science
DOI: 10.21541/apjes.69981
FAVORITE 3 TOTAL DOWNLOAD COUNT 3726

3

3726

Analysis of Users’ Views Evaluation for Online Advance Organizer Concept Teaching Material (ÇİDKOM)
Authors: Fikret Korur , Onur Sevli , Emre Yılmaz, Serhab Berdur
Published: 2016 , Pamukkale University Journal of Education
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 1182

0

1182

Articles published in
Academic Platform - Journal of Engineering and Science
Academic Platform - Journal of Engineering and Science
Acta Infologica
Acta Infologica
Avrupa Bilim ve Teknoloji Dergisi
Avrupa Bilim ve Teknoloji Dergisi
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
El-Cezeri
El-Cezeri
Fırat Üniversitesi Mühendislik Bilimleri Dergisi
Fırat Üniversitesi Mühendislik Bilimleri Dergisi
Gazi University Journal of Science Part A: Engineering and Innovation
Gazi University Journal of Science Part A: Engineering and Innovation
Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi
Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi
International Advanced Researches and Engineering Journal
International Advanced Researches and Engineering Journal
International Journal of 3D Printing Technologies and Digital Industry
International Journal of 3D Printing Technologies and Digital Industry
International Journal of Engineering and Innovative Research
International Journal of Engineering and Innovative Research
International Journal of Engineering Research and Development
International Journal of Engineering Research and Development
International Journal of Sustainable Engineering and Technology
International Journal of Sustainable Engineering and Technology
Journal of Engineering Sciences and Design
Journal of Engineering Sciences and Design
Journal of Intelligent Systems: Theory and Applications
Journal of Intelligent Systems: Theory and Applications
Journal of Scientific Reports-A
Journal of Scientific Reports-A
Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
Pamukkale University Journal of Education
Pamukkale University Journal of Education
Sakarya University Journal of Science
Sakarya University Journal of Science
Turkish Journal of Engineering
Turkish Journal of Engineering
Turkish Journal of Nature and Science
Turkish Journal of Nature and Science
Uluborlu Mesleki Bilimler Dergisi
Uluborlu Mesleki Bilimler Dergisi
Veri Bilimi
Veri Bilimi
Editorship
Uluborlu Mesleki Bilimler Dergisi
Uluborlu Mesleki Bilimler Dergisi
Section Editor
Editorial Board Memberships
Uluborlu Mesleki Bilimler Dergisi
Uluborlu Mesleki Bilimler Dergisi

Reviews

Avrupa Bilim ve Teknoloji Dergisi
Avrupa Bilim ve Teknoloji Dergisi
Bilge International Journal of Science and Technology Research
Bilge International Journal of Science and Technology Research
Duzce University Journal of Science and Technology
Duzce University Journal of Science and Technology
El-Cezeri
El-Cezeri
Engineering Sciences
Engineering Sciences
Fırat Üniversitesi Mühendislik Bilimleri Dergisi
Fırat Üniversitesi Mühendislik Bilimleri Dergisi
Fiscaoeconomia
Fiscaoeconomia
Gazi Journal of Engineering Sciences
Gazi Journal of Engineering Sciences
International Journal of 3D Printing Technologies and Digital Industry
International Journal of 3D Printing Technologies and Digital Industry
International Journal of Economics and Administrative Studies
International Journal of Economics and Administrative Studies
International Journal of Engineering and Innovative Research
International Journal of Engineering and Innovative Research
International Journal of Sustainable Engineering and Technology
International Journal of Sustainable Engineering and Technology
International Journal of Technological Sciences
International Journal of Technological Sciences
Journal of Agricultural Sciences
Journal of Agricultural Sciences
Journal of Engineering Sciences and Design
Journal of Engineering Sciences and Design
Journal of Yalvaç Academy
Journal of Yalvaç Academy
Mehmet Akif Ersoy University Journal of Education Faculty
Mehmet Akif Ersoy University Journal of Education Faculty
Mehmet Akif Ersoy University Journal of The Institute of Educational Sciences
Mehmet Akif Ersoy University Journal of The Institute of Educational Sciences
Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
Sakarya University Journal of Science
Sakarya University Journal of Science
Süleyman Demirel University Journal of Natural and Applied Sciences
Süleyman Demirel University Journal of Natural and Applied Sciences
Turkish Journal of Engineering
Turkish Journal of Engineering
Turkish Journal of Nature and Science
Turkish Journal of Nature and Science
Turkish Journal of Science and Engineering
Turkish Journal of Science and Engineering
Türkiye Bilişim Vakfı Bilgisayar Bilimleri ve Mühendisliği Dergisi
Türkiye Bilişim Vakfı Bilgisayar Bilimleri ve Mühendisliği Dergisi
Uluborlu Mesleki Bilimler Dergisi
Uluborlu Mesleki Bilimler Dergisi

Publications

Deep learning based classification for alzheimer's disease detection using MRI images
Authors: Seda Nur Polater , Onur Sevli
Published: 2024 , Turkish Journal of Engineering
DOI: 10.31127/tuje.1434866
CITED 6 FAVORITE 0 TOTAL DOWNLOAD COUNT 1385

6

0

1385

Wind speed prediction using LSTM and ARIMA time series analysis models: A case study of Gelibolu
Authors: Adem Demirtop , Onur Sevli
Published: 2024 , Turkish Journal of Engineering
DOI: 10.31127/tuje.1431629
CITED 17 FAVORITE 0 TOTAL DOWNLOAD COUNT 2331

17

0

2331

Machine Learning Based Classification for Spam Detection
Authors: Serkan Keskin , Onur Sevli
Published: 2024 , Sakarya University Journal of Science
DOI: 10.16984/saufenbilder.1264476
CITED 3 FAVORITE 0 TOTAL DOWNLOAD COUNT 1573

3

0

1573

COMPARATİVE ANALYSİS OF THE CLASSİFİCATİON OF RECYCLABLE WASTES
Authors: Serkan Keskin , Onur Sevli , Ersan Okatan
Published: 2023 , Journal of Scientific Reports-A
DOI: 10.59313/jsr-a.1335276
CITED 3 FAVORITE 1 TOTAL DOWNLOAD COUNT 1782

3

1

1782

Single and Binary Performance Comparison of Data Compression Algorithms for Text Files
Authors: Serkan Keskin , Onur Sevli , Ersan Okatan
Published: 2023 , Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
DOI: 10.17798/bitlisfen.1301546
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 675

1

0

675

Forecasting Solar Radiation Based on Meteorological Data Using Machine Learning Techniques: A Case Study of Isparta
Authors: Buğra Güzel , Onur Sevli , Ersan Okatan
Published: 2023 , International Journal of Engineering Research and Development
DOI: 10.29137/umagd.1268055
CITED 2 FAVORITE 1 TOTAL DOWNLOAD COUNT 1463

2

1

1463

Examination of Master's Thesis Written in the Field of Artificial Intelligence in Turkey
Authors: Ayşe Alkan , Onur Sevli
Published: 2023 , Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
DOI: 10.47495/okufbed.1062622
CITED 5 FAVORITE 0 TOTAL DOWNLOAD COUNT 3709

5

0

3709

Machine Learning Detection of Collision-Risk Asteroids
Authors: Ömer Can Eskicioğlu , Ali Hakan Isık , Onur Sevli
Published: 2022 , El-Cezeri
DOI: 10.31202/ecjse.1135651
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 1002

1

0

1002

Diyabet hastalığının farklı sınıflandırıcılar kullanılarak teşhisi
Authors: Onur Sevli
Published: 2022 , Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi
DOI: 10.17341/gazimmfd.880750
CITED 8 FAVORITE 1 TOTAL DOWNLOAD COUNT 2342

8

1

2342

Predicting Traffic Accident Severity Using Machine Learning Techniques
Authors: Ali Çelik , Onur Sevli
Published: 2022 , Turkish Journal of Nature and Science
DOI: 10.46810/tdfd.1136432
CITED 11 FAVORITE 0 TOTAL DOWNLOAD COUNT 4044

11

0

4044

A Comparative Analysis of Bank Customers' Loan Propensity Using Machine Learning Methods
Authors: Ali Tezcan Sarızeybek , Onur Sevli
Published: 2022 , Journal of Intelligent Systems: Theory and Applications
DOI: 10.38016/jista.1036047
CITED 4 FAVORITE 1 TOTAL DOWNLOAD COUNT 2660

4

1

2660

A Comparative Study of Heart Disease Diagnosis using Various Classifiers and Resampling Techniques
Authors: Onur Sevli
Published: 2022 , Journal of Intelligent Systems: Theory and Applications
DOI: 10.38016/jista.1069541
CITED 4 FAVORITE 0 TOTAL DOWNLOAD COUNT 1772

4

0

1772

Predicting acceptance of the bank loan offers by using support vector machines
Authors: Mehmet Furkan Akça , Onur Sevli
Published: 2022 , International Advanced Researches and Engineering Journal
DOI: 10.35860/iarej.1058724
CITED 4 FAVORITE 0 TOTAL DOWNLOAD COUNT 3182

4

0

3182

Determining the Income Distribution Levels of Individuals with Machine Learning Techniques
Authors: Sait Taner Canibey , Onur Sevli
Published: 2022 , Osmaniye Korkut Ata University Journal of the Institute of Science and Technology
DOI: 10.47495/okufbed.1039815
CITED 2 FAVORITE 1 TOTAL DOWNLOAD COUNT 807

2

1

807

PREDICTION OF THE MATERIAL TO BE USED IN 3D PRINTING WITH MACHINE LEARNING TECHNIQUES
Authors: Onur Sevli
Published: 2021 , International Journal of 3D Printing Technologies and Digital Industry
DOI: 10.46519/ij3dptdi.1026694
CITED 4 FAVORITE 0 TOTAL DOWNLOAD COUNT 1640

4

0

1640

Turkish sign language digits classification with CNN using different optimizers
Authors: Onur Sevli , Nazan Kemaloğlu
Published: 2020 , International Advanced Researches and Engineering Journal
DOI: 10.35860/iarej.700564
CITED 13 FAVORITE 0 TOTAL DOWNLOAD COUNT 1449

13

0

1449

Performance Comparison of Different Machine Learning Techniques in Diagnosis of Breast Cancer
Authors: Onur Sevli
Published: 2019 , Avrupa Bilim ve Teknoloji Dergisi
DOI: 10.31590/ejosat.553549
CITED 15 FAVORITE 0 TOTAL DOWNLOAD COUNT 7620

15

0

7620

Türkçe Paylaşım Yapan Kullanıcılar İçin Sosyal Ağ Tabanlı Analiz ve Tavsiye Sistemi
Authors: Onur Sevli , Ecir Uğur Küçüksille
Published: 2016 , Academic Platform - Journal of Engineering and Science
DOI: 10.21541/apjes.69981
CITED 2 FAVORITE 3 TOTAL DOWNLOAD COUNT 3726

2

3

3726

Popular Publications: It is determined automatically by the researchers doing research in DergiPark according to the statistics of being added to the favorites. CrossRef Cited: The citations shown in DergiPark are drawn from CrossRef. For this, the cited and cited articles must be registered in CrossRef (DOI number). ^: Citation numbers are reflected in the system by DergiPark at certain periods. : Click to get information about the DergiPark User Badge.