Čupona, Ǵorǵi, Naum Celakoski, and Snežana Ilić. “ON MONOASSOCIATIVE GROUPOIDS”. Matematichki Bilten 26, no. 1 (January 1, 2002): 5–16. Accessed August 15, 2026. https://bilten.smm.org.mk/index.php/bilten/article/view/1680.