@article{SM_1974_22_2_a5,
     author = {E. A. Fadeeva},
     title = {First order hyperbolic equations with constant operator coefficients},
     journal = {Sbornik. Mathematics},
     pages = {257--270},
     year = {1974},
     volume = {22},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1974_22_2_a5/}
}