@article{MAN_1995__303_4_165384,
     author = {Matjaz Omladic and Peter Semrl},
     title = {On non linear perturbations of isometries.},
     journal = {Mathematische Annalen},
     pages = {617--628},
     year = {1995},
     volume = {303},
     number = {4},
     zbl = {0836.46014},
     url = {http://geodesic.mathdoc.fr/item/MAN_1995__303_4_165384/}
}