%0 Journal Article
%A M. E. Perel'man
%T Alternative properties of physical systems and spectral representations in the field theory
%J Doklady Akademii Nauk
%D 1969
%P 781-783
%V 187
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_187_4_a20/
%G ru
%F DAN_1969_187_4_a20