DIMOV, G.; VAKARELOV, D. ON THE INVESTIGATIONS OF IVAN PRODANOV IN THE THEORY OF ABSTRACT SPECTRA. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 102, p. 31–70, 2015. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/63. Acesso em: 22 nov. 2024.