Süer, Meral, and Ravan Ertuğrul. “Isolated Gaps in Almost Symmetric Arf Numerical Semigroups: Characterization Modulo M Classes and Enumeration”. Proceedings of the Bulgarian Academy of Sciences 79, no. 10 (October 28, 2026): 1263–1270. Accessed November 3, 2026. https://proceedings.bas.bg/index.php/cr/article/view/1055.