%0 Journal Article
%A D. A. Popov
%T Asymptotic behaviour of the positive spectrum of a~family of~periodic Sturm--Liouville problems 

%J Izvestiya. Mathematics 
%D 2009
%P 579-610
%V 73
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2009_73_3_a5/
%G en
%F IM2_2009_73_3_a5