@article{MSH_1964__5__27_0,
     author = {Chenon, R.},
     title = {Bi-ordres},
     journal = {Math\'ematiques et sciences humaines},
     pages = {27--32},
     publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique},
     volume = {5},
     year = {1964},
     language = {fr},
     url = {http://www.numdam.org/item/MSH_1964__5__27_0/}
}