@article{bwmeta1.element.bwnjournal-article-aav40i2p217bwm,
author = {Parson, L.},
title = {On the invariants of the Hecke groups},
journal = {Acta Arithmetica},
volume = {40},
year = {1982},
pages = {217-227},
zbl = {0418.10025},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav40i2p217bwm}
}
Parson, L. On the invariants of the Hecke groups. Acta Arithmetica, Tome 40 (1982) pp. 217-227. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav40i2p217bwm/