@article{AIF_1968__18_1_241_0,
     author = {Klein, Joseph and Voutier, Andr\'e},
     title = {Formes ext\'erieures g\'en\'eratrices de sprays},
     journal = {Annales de l'Institut Fourier},
     pages = {241--260},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {18},
     number = {1},
     year = {1968},
     doi = {10.5802/aif.282},
     mrnumber = {40 #863},
     zbl = {0181.49902},
     language = {fr},
     url = {http://www.numdam.org/articles/10.5802/aif.282/}
}