MARKOVSKI, G. Čupona, S. EMBEDDINGS OF UNIVERSAL ALGEBRAS IN SEMIGROUPS. Matematichki Bilten, [S. l.], v. 15, n. 1, 1991. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1499. Acesso em: 13 jun. 2026.