@article{FAA_1972_6_2_a0,
     author = {M. S. Agranovich},
     title = {Theorem on matrices depending on parameters and its applications to hyperbolic systems},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {1--11},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1972_6_2_a0/}
}