%0 Journal Article
%A Ercan, Zafer
%T A generalisation of a theorem of Koldunov with an elementary proof
%J Czechoslovak Mathematical Journal
%D 1999
%P 187-190
%V 49
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMJ_1999__49_1_a17/
%G en
%F CMJ_1999__49_1_a17