%0 Journal Article
%A L. A. Ivanov
%T On lacunae for operators splitting into Euler--Poisson--Darboux factors
%J Doklady Akademii Nauk
%D 1977
%P 535-538
%V 233
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_233_4_a6/
%G ru
%F DAN_1977_233_4_a6