@article{01570574,
title = {A non-differentiablity result for the inversion operator between Sobolev spaces.},
journal = {Zeitschrift f\"ur Analysis und ihre Anwendungen},
volume = {19},
year = {2000},
pages = {639-654},
zbl = {0973.47045},
language = {en},
url = {http://dml.mathdoc.fr/item/01570574}
}
Farkas, G.; Garay, B.M. A non-differentiablity result for the inversion operator between Sobolev spaces.. Zeitschrift für Analysis und ihre Anwendungen, Tome 19 (2000) pp. 639-654. http://gdmltest.u-ga.fr/item/01570574/