@article{SD_1961-1962__15_2_A10_0,
     author = {Clifford, Alfred H.},
     title = {Caract\`eres d'un demi-groupe commutatif},
     journal = {S\'eminaire Dubreil. Alg\`ebre et th\'eorie des nombres},
     note = {talk:21},
     pages = {1--5},
     publisher = {Secr\'etariat math\'ematique},
     volume = {15},
     number = {2},
     year = {1961-1962},
     zbl = {0119.02101},
     language = {fr},
     url = {http://archive.numdam.org/item/SD_1961-1962__15_2_A10_0/}
}