@article{05791552,
title = {The boundary value problem of the equations with nonnegative characteristic form.},
journal = {Boundary Value Problems [electronic only]},
volume = {2010},
year = {2010},
doi = {10.1155/2010/208085},
zbl = {1213.35176},
language = {en},
url = {http://dml.mathdoc.fr/item/05791552}
}
Li, Limei; Ma, Tian. The boundary value problem of the equations with nonnegative characteristic form.. Boundary Value Problems [electronic only], Tome 2010 (2010) . doi : 10.1155/2010/208085. http://gdmltest.u-ga.fr/item/05791552/