@inbook{CIF_1971-1972__8__42_0,
     author = {Malgrange, Bernard},
     title = {Chapitre {III} {Probl\`emes} d'\'equivalence},
     booktitle = {\'Equations de Lie},
     series = {Cours de l'institut Fourier},
     pages = {42--51},
     publisher = {Institut des Math\'ematiques Pures - Universit\'e Scientifique et M\'edicale de Grenoble},
     number = {8},
     year = {1971-1972},
     url = {http://www.numdam.org/item/CIF_1971-1972__8__42_0/}
}