@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/