VLADIMIRSKI, J. On strictly cosingular operators. Lithuanian Mathematical Journal, [S. l.], v. 7, n. 3, p. 399–403, 1967. DOI: 10.15388/LMJ.1967.19980. Disponível em: https://www.journals.vu.lt/LMJ/article/view/19980.. Acesso em: 4 may. 2024.