@article{MS2_1978__43_166614,
     author = {Erik von Essen},
     title = {On stability of {C...} mappings of manifolds with boundary.},
     journal = {Mathematica Scandinavica},
     pages = {197--203},
     publisher = {mathdoc},
     volume = {43},
     year = {1978},
     zbl = {0408.58025},
     url = {http://geodesic.mathdoc.fr/item/MS2_1978__43_166614/}
}