ŠEKUTKOVSKI, Nikita. COHERENT CATEGORY COH. Matematichki Bilten, [S. l.], v. 15, n. 1, p. 23–31, 1991. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1975. Acesso em: 4 sep. 2026.