%0 Journal Article %A Paul S. Muhly %A Mark Tomforde %T Adding tails to $C^*$-correspondences %J Documenta mathematica %D 2004 %P 79-106 %V 9 %U http://geodesic.mathdoc.fr/articles/10.4171/dm/158/ %R 10.4171/dm/158 %F 10_4171_dm_158