@article{DAN_1978_240_4_a6,
     author = {V. I. Ruderfer},
     title = {A priori estimates for the solution of the {Cauchy} problem for a partial differential equation and a system of such equations with coefficients which are nonanalytic in the distinguished variable},
     journal = {Doklady Akademii Nauk},
     pages = {782--785},
     publisher = {mathdoc},
     volume = {240},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_240_4_a6/}
}