@article{DAN_1957_114_4_a1,
     author = {V. M. Borok},
     title = {Reduction to a single equation of an evolutional system of linear partial differential equations with constant coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {682--685},
     year = {1957},
     volume = {114},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_4_a1/}
}