@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/