@article{10_37236_205,
     author = {Refik Keskin and Bahar Demirt\"urk},
     title = {On suborbital graphs for the normalizer of {\(\Gamma} {_{0}(N)\)}},
     journal = {The electronic journal of combinatorics},
     year = {2009},
     volume = {16},
     number = {1},
     doi = {10.37236/205},
     zbl = {1201.05045},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/205/}
}