@article{GDZPPN002311933,
title = {Units in the Modular Function Field. I.},
journal = {Mathematische Annalen},
volume = {217},
year = {1975},
pages = {67-96},
zbl = {0311.14005},
url = {http://dml.mathdoc.fr/item/GDZPPN002311933}
}
Kubert, Dan; Lang, Serge. Units in the Modular Function Field. I.. Mathematische Annalen, Tome 217 (1975) pp. 67-96. http://gdmltest.u-ga.fr/item/GDZPPN002311933/