%0 Journal Article
%A M. Sh. Birman
%A T. A. Suslina
%T Periodic differential operators of second order. Threshold properties and averagings
%J Algebra i analiz
%D 2003
%P 1-108
%V 15
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AA_2003_15_5_a0/
%G ru
%F AA_2003_15_5_a0