@article{MSH_1987__98__5_0,
     author = {Leclerc, B. and Monjardet, B.},
     title = {Avant-propos},
     journal = {Math\'ematiques et sciences humaines},
     pages = {5--7},
     publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique},
     volume = {98},
     year = {1987},
     language = {fr},
     url = {http://www.numdam.org/item/MSH_1987__98__5_0/}
}