@article{IVM_1970_8_a14,
     author = {B. P. Tkach},
     title = {The existence of periodic solutions of nonlinear partial differential equations of neutral type},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {112--117},
     publisher = {mathdoc},
     number = {8},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_8_a14/}
}