Bahadir O. Guler and Serkan Kader and Murat Besenk, On Suborbital Graphs of the Congruence Subgroup r 0(N). journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. July 2008, vol. 19(7). 499 - 502 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/5692.