KOVATCHEVA, E. Visible and Invisible Bulgarian Heritage: (One research under the Bulgarian Heritage published on the Web). Digital Presentation and Preservation of Cultural and Scientific Heritage, [S. l.], v. 3, p. 139–146, 2013. DOI: 10.55630/dipp.2013.3.15. Disponível em: https://dipp.math.bas.bg/dipp/article/view/dipp.2013.3.15. Acesso em: 2 may. 2024.