BOGDANOVA, G.; TODOROV, T.; NOEV, N. Digital Repository of Information and Knowledge - Fund “BellKnow”. Digital Presentation and Preservation of Cultural and Scientific Heritage, [S. l.], v. 1, p. 91–98, 2011. DOI: 10.55630/dipp.2011.1.10. Disponível em: https://dipp.math.bas.bg/dipp/article/view/dipp.2011.1.10. Acesso em: 28 may. 2024.