%0 Journal Article
%A V. M. Babich
%T Mechanical systems, proper oscilations, and spectral theory of selfadjoint operators
%J Zapiski Nauchnykh Seminarov POMI
%D 1994
%P 12-16
%V 218
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_1994_218_a1/
%G ru
%F ZNSL_1994_218_a1