Jaipong P, Tapanyo W. Connectivity of Suborbital Graphs for the Congruence Subgroups of the Extended Modular Group. Comm. Math. Appl. [Internet]. 2017 Dec. 30 [cited 2025 Jun. 17];8(3):345-58. Available from: http://www.journals.rgnpublications.com/index.php/cma/article/view/549