@article{ADM_2019_27_1_a3, author = {Pradthana Jaipong and Wanchai Tapanyo}, title = {Generalized classes of suborbital graphs for the congruence subgroups of the modular group}, journal = {Algebra and discrete mathematics}, pages = {20--36}, publisher = {mathdoc}, volume = {27}, number = {1}, year = {2019}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ADM_2019_27_1_a3/} }