%0 Journal Article %A S. L. Sobolev %T On vibrations of a~half-plane and of a~lamina under arbitrary initial conditions %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1968 %P 95-129 %V 23 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1968_23_5_a2/ %G en %F RM_1968_23_5_a2