[1]
Ǵ. Čupona and N. Celakoski, “FREE GROUPOIDS WITH xy2=xy”, Mat. Bilt., vol. 21, no. 1, pp. 5–16, Jan. 1997, Accessed: Nov. 01, 2026. Available: https://bilten.smm.org.mk/index.php/bilten/article/view/1569