On the infinite volume Hecke surfaces
Compositio Mathematica, Tome 95 (1995) no. 3, pp. 247-262. 
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     author = {Schmidt, Thomas A. and Sheingorn, Mark},
     title = {On the infinite volume {Hecke} surfaces},
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     pages = {247--262},
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     volume = {95},
     number = {3},
     year = {1995},
     mrnumber = {1318087},
     zbl = {0838.30039},
     language = {en},
     url = {http://www.numdam.org/item/CM_1995__95_3_247_0/}
}
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Schmidt, Thomas A.; Sheingorn, Mark. On the infinite volume Hecke surfaces. Compositio Mathematica, Tome 95 (1995) no. 3, pp. 247-262. http://www.numdam.org/item/CM_1995__95_3_247_0/

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