@article{SD_1969-1970__23_2_A2_0,
     author = {Schwarz, \v{S}tefan},
     title = {On the structure of dual semigroups},
     journal = {S\'eminaire Dubreil. Alg\`ebre et th\'eorie des nombres},
     note = {talk:DG 2},
     pages = {DG1--DG5},
     publisher = {Secr\'etariat math\'ematique},
     volume = {23},
     number = {2},
     year = {1969-1970},
     zbl = {0228.20038},
     language = {en},
     url = {http://www.numdam.org/item/SD_1969-1970__23_2_A2_0/}
}