LAYEGH, L.; DAVVAZ, B. Fundamental relation on hyper BCI-algebras. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 123, n. 3, p. 121–129, 2026. DOI: 10.31489/2026m3/121-129. Disponível em: https://mts.buketov.edu.kz/mathematics-vestnik/article/view/858. Acesso em: 30 sep. 2026.