@article{10_4153_CJM_1973_093_5,
     author = {Best, L. A.},
     title = {Subgroups of {One-Relator} {Fuchsian} {Groups}},
     journal = {Canadian journal of mathematics},
     pages = {888--891},
     year = {1973},
     volume = {25},
     number = {4},
     doi = {10.4153/CJM-1973-093-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-093-5/}
}