@article{IVM_1958_4_a19,
     author = {O. K. Omel'chenko},
     title = {The distribution of zeros of eigenfunctions of a~self-adjoint elliptic operator of the second order},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {184--190},
     publisher = {mathdoc},
     number = {4},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1958_4_a19/}
}