@article{10_4171_dm_158,
     author = {Paul S. Muhly and Mark Tomforde},
     title = {Adding tails to $C^*$-correspondences},
     journal = {Documenta mathematica},
     pages = {79--106},
     year = {2004},
     volume = {9},
     doi = {10.4171/dm/158},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/158/}
}