@inproceedings{DBLP:conf/pods/FanL01,
  author    = {Wenfei Fan and
               Leonid Libkin},
  title     = {On XML Integrity Constraints in the Presence of DTDs},
  booktitle = {PODS},
  year      = {2001},
  ee        = {http://doi.acm.org/10.1145/375551.375568, http://www.acm.org/sigs/sigmod/pods/proc01/online/p54.pdf},
  crossref  = {DBLP:conf/pods/2001},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/pods/2001,
  editor    = {Peter Buneman},
  title     = {Proceedings of the Twentieth ACM SIGACT-SIGMOD-SIGART Symposium
               on Principles of Database Systems, May 21-23, 2001, Santa
               Barbara, California, USA},
  publisher = {ACM},
  year      = {2001},
  isbn      = {1-58113-361-8},
  ee        = {http://dl.acm.org/citation.cfm?id=375551},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}