Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1980__21_2_a9, author = {Lee, Sin Min}, title = {On a simple one-element extension of left zero semigroups}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {313--318}, publisher = {mathdoc}, volume = {21}, number = {2}, year = {1980}, mrnumber = {580686}, zbl = {0437.08005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1980__21_2_a9/} }
Lee, Sin Min. On a simple one-element extension of left zero semigroups. Commentationes Mathematicae Universitatis Carolinae, Tome 21 (1980) no. 2, pp. 313-318. http://geodesic.mathdoc.fr/item/CMUC_1980__21_2_a9/