Our journal offers a DOI service for our authors via Zenodo. Zenodo is a service developed under the European OpenAIRE program and supported by CERN (Swiss Center for Atomic Research). Zenodo offers a free service and supports storage and sharing of all types of academic DOI numbers. DOIs obtained through Zenodo enable permanent access to the work and provide researchers with widespread access. DOIs obtained via Zenodo are managed according to international standards and ensure verifiability. Articles received via Zenodo are indexed in the European OpenAIRE.