@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/