@article{ZNSL_1986_152_a5,
     author = {L. V. Kapitanski},
     title = {Absence of time-periodic solutions to certain multidimensional nonlinear wave equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {55--66},
     publisher = {mathdoc},
     volume = {152},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_152_a5/}
}