@inproceedings{DBLP:conf/er/Vigna04,
  author    = {Sebastiano Vigna},
  title     = {Reachability Problems in Entity-Relationship Schema Instances},
  booktitle = {ER},
  year      = {2004},
  pages     = {96-109},
  ee        = {http://dx.doi.org/10.1007/978-3-540-30464-7_9},
  crossref  = {DBLP:conf/er/2004},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/er/2004,
  editor    = {Paolo Atzeni and
               Wesley W. Chu and
               Hongjun Lu and
               Shuigeng Zhou and
               Tok Wang Ling},
  title     = {Conceptual Modeling - ER 2004, 23rd International Conference
               on Conceptual Modeling, Shanghai, China, November 2004,
               Proceedings},
  booktitle = {ER},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {3288},
  year      = {2004},
  isbn      = {3-540-23723-2},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}