@article{JMPA_1879_3_5__285_0,
     author = {Halphen},
     title = {Sur certaines propri\'et\'es m\'etriques relatives aux polygones de {Poncelet}},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {285--292},
     publisher = {Gauthier-Villars},
     volume = {3e s{\'e}rie, 5},
     year = {1879},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1879_3_5__285_0/}
}