%0 Journal Article %A Simon Willerton %T Tight spans, Isbell completions and semi-tropical modules %J Theory and applications of categories %D 2013 %P 696-732 %V 28 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAC_2013_28_a21/ %G en %F TAC_2013_28_a21