@article{03753023, title = {On free ring extensions of degree n.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {4}, year = {1981}, pages = {703-709}, doi = {10.1155/S0161171281000537}, zbl = {0479.16002}, language = {en}, url = {http://dml.mathdoc.fr/item/03753023} }
Szeto, George. On free ring extensions of degree n.. International Journal of Mathematics and Mathematical Sciences, Tome 4 (1981) pp. 703-709. doi : 10.1155/S0161171281000537. http://gdmltest.u-ga.fr/item/03753023/