@article{GDZPPN00209133X,
title = {Rational Functions Invariant under a Finite Abelian Group.},
journal = {Inventiones mathematicae},
volume = {27},
year = {1974},
pages = {299-325},
zbl = {0292.20010},
url = {http://dml.mathdoc.fr/item/GDZPPN00209133X}
}
Lenstra, H.W. Jr. Rational Functions Invariant under a Finite Abelian Group.. Inventiones mathematicae, Tome 27 (1974) pp. 299-325. http://gdmltest.u-ga.fr/item/GDZPPN00209133X/