@article{GDZPPN001250582, title = {A new proof of the McAlister "P-theorem".}, journal = {Semigroup forum}, volume = {11}, year = {1975}, pages = {185-188}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN001250582} }
Schein, B.M. A new proof of the McAlister "P-theorem".. Semigroup forum, Tome 11 (1975) pp. 185-188. http://gdmltest.u-ga.fr/item/GDZPPN001250582/