%0 Journal Article %A Irmer, Ingrid %T The Chillingworth class is a signed stable length %J Algebraic and Geometric Topology %D 2015 %P 1863-1876 %V 15 %N 4 %U http://geodesic.mathdoc.fr/articles/10.2140/agt.2015.15.1863/ %R 10.2140/agt.2015.15.1863 %F 10_2140_agt_2015_15_1863