KOPYLOV, Yaroslav. On the Lambek Invariants of Commutative Squares in a Quasi-Abelian Category. Scientia, [S. l.], v. 11, p. 57–67, 2025. DOI: 10.71712/. Disponível em: https://revistas.usm.cl/scientia/article/view/73. Acesso em: 13 jun. 2026.