@inbook{CIF_1969__2__1_0,
     author = {Rodrigues, A. Martins},
     title = {Chapitre {I} $G$-structures d{\textquoteright}ordre $1$},
     booktitle = {G-structures et pseudo-groupes de Lie},
     series = {Cours de l'institut Fourier},
     pages = {1--18},
     publisher = {Institut des Math\'ematiques Pures - Universit\'e Scientifique et M\'edicale de Grenoble},
     number = {2},
     year = {1969},
     url = {http://www.numdam.org/item/CIF_1969__2__1_0/}
}