%0 Journal Article %A L. V. Kapitanski %T Absence of time-periodic solutions to certain multidimensional nonlinear wave equations %J Zapiski Nauchnykh Seminarov POMI %D 1986 %P 55-66 %V 152 %U http://geodesic.mathdoc.fr/item/ZNSL_1986_152_a5/ %G ru %F ZNSL_1986_152_a5