@article{CMFD_2006_16_a7,
     author = {E. V. Radkevich},
     title = {On well-posedness of the {Cauchy} {Problem} and the {Mixed} {Problem} for some class of hyperbolic systems and equations with constant coefficients and variable multiplicity of characteristics},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {110--135},
     publisher = {mathdoc},
     volume = {16},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2006_16_a7/}
}