Kovacheva, S., and L. Dimitrova. ‚ÄúRealization of a Collection of Digital Resources for Cultural Heritage Sites As a Basis for Formation of Skills and Competencies‚ÄĚ. Digital Presentation and Preservation of Cultural and Scientific Heritage, vol. 12, Sept. 2022, pp. 217-26, doi:10.55630/dipp.2022.12.18.