@article{MSH_1973__42__17_0,
     author = {Besson, M.},
     title = {\`A propos des distances entre ensembles de parties},
     journal = {Math\'ematiques et sciences humaines},
     pages = {17--35},
     publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique},
     volume = {42},
     year = {1973},
     mrnumber = {363913},
     zbl = {0268.04004},
     language = {fr},
     url = {http://www.numdam.org/item/MSH_1973__42__17_0/}
}