On the number of subgroups of given index in the modular group.
Imrich, W. ; Razen, R.
Monatshefte für Mathematik, Tome 87 (1979), p. 273-280 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1979-01-01
EUDML-ID : urn:eudml:doc:177918 
@article{GDZPPN00248157X,
     title = {On the number of subgroups of given index in the modular group.},
     journal = {Monatshefte f\"ur Mathematik},
     volume = {87},
     year = {1979},
     pages = {273-280},
     zbl = {0407.20037},
     url = {http://dml.mathdoc.fr/item/GDZPPN00248157X}
}

Imrich, W.; Razen, R. On the number of subgroups of given index in the modular group.. Monatshefte für Mathematik, Tome 87 (1979) pp. 273-280. http://gdmltest.u-ga.fr/item/GDZPPN00248157X/