@article{MSH_1971__34__5_0,
     author = {Guilbaud, G. Th.},
     title = {Avant-propos},
     journal = {Math\'ematiques et sciences humaines},
     pages = {5--5},
     publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique},
     volume = {34},
     year = {1971},
     language = {fr},
     url = {http://www.numdam.org/item/MSH_1971__34__5_0/}
}