@article{IVM_1999_4_a4,
     author = {V. F. Volkodavov and V. N. Zakharov},
     title = {Extremal properties of solutions of a~third-order equation of hyperbolic type in three-dimensional space and their application},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {28--31},
     publisher = {mathdoc},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1999_4_a4/}
}