@article{01154627, title = {On the boundary value problem in a dihedral angle for normally hyperbolic systems of first order.}, journal = {Georgian Mathematical Journal}, volume = {5}, year = {1998}, pages = {121-138}, doi = {10.1007/BF02767992}, zbl = {0902.35067}, language = {en}, url = {http://dml.mathdoc.fr/item/01154627} }
Jokhadze, O. On the boundary value problem in a dihedral angle for normally hyperbolic systems of first order.. Georgian Mathematical Journal, Tome 5 (1998) pp. 121-138. doi : 10.1007/BF02767992. http://gdmltest.u-ga.fr/item/01154627/