Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1971__12_3_a3, author = {Goral\v{c}{\'\i}k, Pavel}, title = {One remarkable property of the bicyclic semigroup}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {503--518}, publisher = {mathdoc}, volume = {12}, number = {3}, year = {1971}, mrnumber = {0289686}, zbl = {0236.20049}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1971__12_3_a3/} }
Goralčík, Pavel. One remarkable property of the bicyclic semigroup. Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 3, pp. 503-518. http://geodesic.mathdoc.fr/item/CMUC_1971__12_3_a3/