@article{MSH_1967__20__29_0,
     author = {Lawoll, C.},
     title = {Traverser le miroir},
     journal = {Math\'ematiques et sciences humaines},
     pages = {29--32},
     publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique},
     volume = {20},
     year = {1967},
     language = {fr},
     url = {http://archive.numdam.org/item/MSH_1967__20__29_0/}
}