@book{MSM_1926__19__1_0,
     author = {Lagrange, R.},
     title = {Calcul diff\'erentiel absolu},
     series = {M\'emorial des sciences math\'ematiques},
     publisher = {Gauthier-Villars},
     number = {19},
     year = {1926},
     language = {fr},
     url = {http://archive.numdam.org/item/MSM_1926__19__1_0/}
}