%0 Journal Article
%A E. M. Landis
%T A three-spheres theorem
%J Doklady Akademii Nauk
%D 1963
%P 277-279
%V 148
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a9/
%G ru
%F DAN_1963_148_2_a9