Geodesic
Discrete subgroups of $\mathrm{PL}(2,k_\mathfrak p)$
Matematika, Tome 12 (1968) no. 5, pp. 131-138 
Ya. Ihara. Discrete subgroups of $\mathrm{PL}(2,k_\mathfrak p)$. Matematika, Tome 12 (1968) no. 5, pp. 131-138. http://geodesic.mathdoc.fr/item/MAT_1968_12_5_a4/
@article{MAT_1968_12_5_a4,
     author = {Ya. Ihara},
     title = {Discrete subgroups of $\mathrm{PL}(2,k_\mathfrak p)$},
     journal = {Matematika},
     pages = {131--138},
     year = {1968},
     volume = {12},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1968_12_5_a4/}
}
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