@article{SPHM_1987___5_A1_0,
     author = {Haddad, Labib},
     title = {Condorcet et les ultrafiltres},
     journal = {S\'eminaire de Philosophie et Math\'ematiques},
     pages = {0--26},
     publisher = {\'Ecole Normale Sup\'erieure},
     number = {5},
     year = {1987},
     language = {fr},
     url = {http://archive.numdam.org/item/SPHM_1987___5_A1_0/}
}