@article{JMPA_1939_9_18__303_0,
     author = {Delens, Paul},
     title = {Sur quelques nouvelles acquisitions de la g\'eom\'etrie du t\'etra\`edre},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {303--321},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 18},
     year = {1939},
     zbl = {0023.15606},
     language = {fr},
     url = {http://archive.numdam.org/item/JMPA_1939_9_18__303_0/}
}