%0 Journal Article
%A B. Shmuttsler
%T Estimates for the number of points of the negative spectrum of a class of pseudodifferential operators
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 1990
%P 3-5
%N 4
%U http://geodesic.mathdoc.fr/item/VMUMM_1990_4_a0/
%G ru
%F VMUMM_1990_4_a0