%0 Journal Article %A Kai Ishihara %A Atsushi Ishii %T An operator invariant for handlebody-knots %J Fundamenta Mathematicae %D 2012 %P 233-247 %V 217 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm217-3-3/ %R 10.4064/fm217-3-3 %G en %F 10_4064_fm217_3_3