%0 Journal Article
%A P. S. Aleksandrov
%A V. I. Ponomarev
%T Projection spectra and canonical coverings
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1963
%V 18
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1963_18_5_a9/
%G ru
%F RM_1963_18_5_a9