@book{MSM_1934__65__1_0,
     author = {D'Adh\'emar, Robert},
     title = {La balistique ext\'erieure},
     series = {M\'emorial des sciences math\'ematiques},
     publisher = {Gauthier-Villars},
     number = {65},
     year = {1934},
     language = {fr},
     url = {http://www.numdam.org/item/MSM_1934__65__1_0/}
}