@article{01482126,
title = {The maximum principle for equations with composite coefficients.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2000},
year = {2000},
zbl = {0952.35025},
language = {en},
url = {http://dml.mathdoc.fr/item/01482126}
}
Lieberman, Gary M. The maximum principle for equations with composite coefficients.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2000 (2000) . http://gdmltest.u-ga.fr/item/01482126/