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@article{DAN_1966_167_6_a0, author = {M. S. Agranovich}, title = {Positive mixed problems for certain hyperbolic systems}, journal = {Doklady Akademii Nauk}, pages = {1215--1218}, publisher = {mathdoc}, volume = {167}, number = {6}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1966_167_6_a0/} }
M. S. Agranovich. Positive mixed problems for certain hyperbolic systems. Doklady Akademii Nauk, Tome 167 (1966) no. 6, pp. 1215-1218. http://geodesic.mathdoc.fr/item/DAN_1966_167_6_a0/