@article{IVM_1978_2_a3,
     author = {V. Ya. Ivrii},
     title = {Correctness in {Gevrey} classes of the {Cauchy} problem for certain nonstrictly hyperbolic operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {26--35},
     publisher = {mathdoc},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1978_2_a3/}
}