@article{01125925,
title = {A lower bound for the gradient of },
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {1996},
year = {1996},
zbl = {0886.35028},
language = {en},
url = {http://dml.mathdoc.fr/item/01125925}
}
Rosset, Edi. A lower bound for the gradient of . Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 1996 (1996) . http://gdmltest.u-ga.fr/item/01125925/