Geodesic
On the number of subgroups of given index in the modular group.
Monatshefte für Mathematik, Tome 87 (1979), pp. 273-280.

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Mots-clés : Number of Subgroups of Given Index in the Modular Group 
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     author = {W. Imrich and R. Razen},
     title = {On the number of subgroups of given index in the modular group.},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {273--280},
     publisher = {mathdoc},
     volume = {87},
     year = {1979},
     zbl = {0407.20037},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1979__87_177918/}
}
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W. Imrich; R. Razen. On the number of subgroups of given index in the modular group.. Monatshefte für Mathematik, Tome 87 (1979), pp. 273-280. http://geodesic.mathdoc.fr/item/MOMA_1979__87_177918/