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@article{MM2_1992__76_1_155757, author = {Masataka Tomari and Kei-ichi Watanabe}, title = {Normal {Zr-Graded} {Rings} and {Normal} {Cyclic} {Covers.}}, journal = {Manuscripta mathematica}, pages = {325--340}, publisher = {mathdoc}, volume = {76}, number = {1}, year = {1992}, zbl = {0780.13001}, url = {http://geodesic.mathdoc.fr/item/MM2_1992__76_1_155757/} }
Masataka Tomari; Kei-ichi Watanabe. Normal Zr-Graded Rings and Normal Cyclic Covers.. Manuscripta mathematica, Tome 76 (1992) no. 1, pp. 325-340. http://geodesic.mathdoc.fr/item/MM2_1992__76_1_155757/