@article{IVM_1966_6_a12,
     author = {A. I. Perov},
     title = {A~multi-dimensional linear differential equation of the second order with constant coefficient},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {117--124},
     publisher = {mathdoc},
     number = {6},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1966_6_a12/}
}