@article{GDZPPN002435853,
title = {A Theorem on Elliptic Differential Inequalities with an Application to Gradient Bounds.},
journal = {Mathematische Zeitschrift},
volume = {199},
year = {1988},
pages = {293-300},
zbl = {0646.35034},
url = {http://dml.mathdoc.fr/item/GDZPPN002435853}
}
Walter, Wolfgang. A Theorem on Elliptic Differential Inequalities with an Application to Gradient Bounds.. Mathematische Zeitschrift, Tome 199 (1988) pp. 293-300. http://gdmltest.u-ga.fr/item/GDZPPN002435853/