Karaivanova, A., E. Atanassov, T. Gurov, P. Stanchev, and G. Simeonov. “Bulgarian Contribution to the Open Science Services in NI4OS-Europe”. Digital Presentation and Preservation of Cultural and Scientific Heritage, vol. 12, Sept. 2022, pp. 299-06, doi:10.55630/dipp.2022.12.29.