@article{05237143,
title = {Subsolutions of elliptic operators in divergence form and application to two-phase free boundary problems.},
journal = {Boundary Value Problems [electronic only]},
volume = {2007},
year = {2007},
doi = {10.1155/2007/57049},
zbl = {1188.35070},
language = {en},
url = {http://dml.mathdoc.fr/item/05237143}
}
Ferrari, Fausto; Salsa, Sandro. Subsolutions of elliptic operators in divergence form and application to two-phase free boundary problems.. Boundary Value Problems [electronic only], Tome 2007 (2007) . doi : 10.1155/2007/57049. http://gdmltest.u-ga.fr/item/05237143/