@article{MMO_1980_41_a2,
     author = {M. D. Bron\v{s}teǐn},
     title = {The {Cauchy} problem for hyperbolic operators with characteristics of variable multiplicity},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {83--99},
     publisher = {mathdoc},
     volume = {41},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1980_41_a2/}
}