@article{MM2_1993__81_3-4_155905,
     author = {Alexis Bonnet},
     title = {A {Deformation} {Lemma} on a {C1} manifold.},
     journal = {Manuscripta mathematica},
     pages = {339--360},
     publisher = {mathdoc},
     volume = {81},
     number = {3-4},
     year = {1993},
     zbl = {0801.57023},
     url = {http://geodesic.mathdoc.fr/item/MM2_1993__81_3-4_155905/}
}