GIMISHEVA, A.; RUSEVA, V. NBU Digital Collection “Bulgarian Cultural Heritage Materials”. Digital Presentation and Preservation of Cultural and Scientific Heritage, [S. l.], v. 2, p. 177–182, 2012. DOI: 10.55630/dipp.2012.2.11. Disponível em: https://dipp.math.bas.bg/dipp/article/view/dipp.2012.2.11. Acesso em: 2 may. 2024.