@article{01334842, title = {Control subgroups and birational extensions of graded rings.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {22}, year = {1999}, pages = {411-415}, doi = {10.1155/S0161171299224118}, zbl = {0932.16042}, language = {en}, url = {http://dml.mathdoc.fr/item/01334842} }
Hussein, Salah El Din S. Control subgroups and birational extensions of graded rings.. International Journal of Mathematics and Mathematical Sciences, Tome 22 (1999) pp. 411-415. doi : 10.1155/S0161171299224118. http://gdmltest.u-ga.fr/item/01334842/