@article{IM_1977__39_142458,
     author = {B. Malgrange},
     title = {Frobenius avec singularites. 2. {Le} cas general},
     journal = {Inventiones mathematicae},
     pages = {67--90},
     publisher = {mathdoc},
     volume = {39},
     year = {1977},
     zbl = {0375.32012},
     url = {http://geodesic.mathdoc.fr/item/IM_1977__39_142458/}
}