@article{GDZPPN001247395, title = {Baer extensions of rings and Stone extensions of semigroups.}, journal = {Semigroup forum}, volume = {2}, year = {1971}, pages = {55-63}, zbl = {0225.20041}, url = {http://dml.mathdoc.fr/item/GDZPPN001247395} }
Keimel, K. Baer extensions of rings and Stone extensions of semigroups.. Semigroup forum, Tome 2 (1971) pp. 55-63. http://gdmltest.u-ga.fr/item/GDZPPN001247395/