%0 Journal Article
%A Yu. G. Safarov
%T Exact asymptotics of the spectrum of a~boundary value problem, and periodic billiards
%J Izvestiya. Mathematics 
%D 1989
%P 553-573
%V 33
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1989_33_3_a4/
%G en
%F IM2_1989_33_3_a4