%0 Journal Article
%A E. V. Damaskinsky
%T Invariant Weyl systems that are not $U$-cyclic (note on Hegerfeldt and Melsheimer's paper)
%J Teoretičeskaâ i matematičeskaâ fizika
%D 1973
%P 221-226
%V 15
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TMF_1973_15_2_a4/
%G ru
%F TMF_1973_15_2_a4