@article{SD_1959-1960__13_2_A4_0,
     author = {Lefebvre, Pierre},
     title = {Sur la structure des demi-groupes idempotents},
     journal = {S\'eminaire Dubreil. Alg\`ebre et th\'eorie des nombres},
     note = {talk:14},
     pages = {1--17},
     publisher = {Secr\'etariat math\'ematique},
     volume = {13},
     number = {2},
     year = {1959-1960},
     zbl = {0125.01302},
     language = {fr},
     url = {http://www.numdam.org/item/SD_1959-1960__13_2_A4_0/}
}