@article{GDZPPN002303558, title = {Adjoining a Unit to a Biregular Ring.}, journal = {Mathematische Annalen}, volume = {189}, year = {1970}, pages = {219-226}, zbl = {0191.03402}, url = {http://dml.mathdoc.fr/item/GDZPPN002303558} }
VRABEC, J. Adjoining a Unit to a Biregular Ring.. Mathematische Annalen, Tome 189 (1970) pp. 219-226. http://gdmltest.u-ga.fr/item/GDZPPN002303558/