%0 Journal Article
%A J. Mohrherr
%T A conjecture of Ershov for a relative hierarchy fails near $\mathcal{O}$
%J Algebra i logika
%D 1983
%P 232-235
%V 22
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1983_22_2_a9/
%G en
%F AL_1983_22_2_a9