@article{DAN_1964_154_6_a8,
     author = {L. Ya. Pyanzina},
     title = {Approximation of the solutions of boundary-value problems for parabolic and hyperbolic equations by solutions of the {Cauchy} problem},
     journal = {Doklady Akademii Nauk},
     pages = {1276--1279},
     publisher = {mathdoc},
     volume = {154},
     number = {6},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_154_6_a8/}
}