@article{02100291,
title = {Local invariance via comparison functions.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2004},
year = {2004},
zbl = {1058.34063},
language = {en},
url = {http://dml.mathdoc.fr/item/02100291}
}
Carja, Ovidiu; Necula, Mihai; Vrabie, Ioan I. Local invariance via comparison functions.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2004 (2004) . http://gdmltest.u-ga.fr/item/02100291/