Stanchev, P., Ancheva, H. and Karaivanova, A. 2021. The 12th National Information Day: Open Science, Open Data, Open Access, Bulgarian Open Science Cloud. Digital Presentation and Preservation of Cultural and Scientific Heritage. 11, (Sep. 2021), 333–340. DOI:https://doi.org/10.55630/dipp.2021.11.33.