@article{GDZPPN002233479,
title = {Normal Zr-Graded Rings and Normal Cyclic Covers.},
journal = {Manuscripta mathematica},
volume = {76},
year = {1992},
pages = {325-340},
zbl = {0780.13001},
url = {http://dml.mathdoc.fr/item/GDZPPN002233479}
}
Tomari, Masataka; Watanabe, Kei-ichi. Normal Zr-Graded Rings and Normal Cyclic Covers.. Manuscripta mathematica, Tome 76 (1992) pp. 325-340. http://gdmltest.u-ga.fr/item/GDZPPN002233479/