@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/