@article{IM_1985__82_143286,
     author = {G. Metivier},
     title = {Uniqueness and approximation of {Solutions} of first order non linear equations.},
     journal = {Inventiones mathematicae},
     pages = {263--282},
     publisher = {mathdoc},
     volume = {82},
     year = {1985},
     zbl = {0594.35018},
     url = {http://geodesic.mathdoc.fr/item/IM_1985__82_143286/}
}