@article{MMO_1978_37_a0,
     author = {V. M. Petkov},
     title = {The parametrix of the {Cauchy} problem for nonsymmetrizable hyperbolic systems with characteristics of constant multiplicity},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {3--47},
     publisher = {mathdoc},
     volume = {37},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1978_37_a0/}
}