%0 Journal Article
%A Goda, Hiroshi
%A Scharlemann, Martin
%A Thompson, Abigail
%T Levelling an unknotting tunnel
%J Geometry & topology
%D 2000
%P 243-275
%V 4
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.2140/gt.2000.4.243/
%R 10.2140/gt.2000.4.243
%F GT_2000_4_1_a7