Ivanova, Kalina, Galina Bogdanova, Kaloyan Zdravkov, Radoslav Pavlov, and Desislava Paneva-Marinova. 2014. “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):263-69. https://doi.org/10.55630/dipp.2014.4.32.