@article{GDZPPN002482924, title = {On Free Quadratic Extensions of Rings.}, journal = {Monatshefte f\"ur Mathematik}, volume = {91}, year = {1981}, pages = {323-328}, zbl = {0461.16008}, url = {http://dml.mathdoc.fr/item/GDZPPN002482924} }
Szeto, George; Wong, Yuen-Fat. On Free Quadratic Extensions of Rings.. Monatshefte für Mathematik, Tome 91 (1981) pp. 323-328. http://gdmltest.u-ga.fr/item/GDZPPN002482924/