Grancharova-Hristova, M., Moraliyska, N., Glushkova, T., & Rusev, K. (2022). Virtualization, Processing, and Standardization of Knowledge about Bulgarian Cultural, Historical and Natural Heritage for Use in School Education. Digital Presentation and Preservation of Cultural and Scientific Heritage, 12, 131–140. https://doi.org/10.55630/dipp.2022.12.10