Stanchev, P., K. Angelieva, Y. Zherkova, R. Pavlov, and G. Simeonov. “The Tenth National Information Day: Open Science, Open Data, Open Access, Bulgarian Open Science Cloud”. Digital Presentation and Preservation of Cultural and Scientific Heritage, vol. 9, Sept. 2019, pp. 403-8, doi:10.55630/dipp.2019.9.44.