@article{GDZPPN00223789X,
title = {The Equations for Modular Function Fields of Principal congruence subgroups of prime level.},
journal = {Manuscripta mathematica},
volume = {91},
year = {1996},
pages = {271-286},
zbl = {0871.11031},
url = {http://dml.mathdoc.fr/item/GDZPPN00223789X}
}
Ishida, Nobuhiko; Ishii, Noburo. The Equations for Modular Function Fields of Principal congruence subgroups of prime level.. Manuscripta mathematica, Tome 91 (1996) pp. 271-286. http://gdmltest.u-ga.fr/item/GDZPPN00223789X/