Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1979__20_3_a10, author = {Luedeman, John K.}, title = {Closure operations and semigroups of quotients}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {529--537}, publisher = {mathdoc}, volume = {20}, number = {3}, year = {1979}, mrnumber = {550454}, zbl = {0412.20062}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1979__20_3_a10/} }
Luedeman, John K. Closure operations and semigroups of quotients. Commentationes Mathematicae Universitatis Carolinae, Tome 20 (1979) no. 3, pp. 529-537. http://geodesic.mathdoc.fr/item/CMUC_1979__20_3_a10/