Ivanova, Kalina, Galina Bogdanova, Kaloyan Zdravkov, Radoslav Pavlov, and Desislava Paneva-Marinova. “Project ‘North +’: Documenting, Preserving and Providing Public Access to the Cultural Heritage in Libraries, Museums, Archives and Galleries in North and Central Bulgaria”. Digital Presentation and Preservation of Cultural and Scientific Heritage 4 (September 30, 2014): 263–269. Accessed May 4, 2024. https://dipp.math.bas.bg/dipp/article/view/dipp.2014.4.32.