@article{<a href="http://dblp.uni-trier.de/db/about/bibtex.html">DBLP</a>:journals/pvldb/Shirani-MehrKS12,
  author    = {Houtan Shirani-Mehr and
               Farnoush Banaei Kashani and
               Cyrus Shahabi},
  title     = {Efficient Reachability Query Evaluation in Large Spatiotemporal
               Contact Datasets},
  journal   = {PVLDB},
  volume    = {5},
  number    = {9},
  year      = {2012},
  pages     = {848-859},
  ee        = {http://vldb.org/pvldb/vol5/p848_houtanshirani-mehr_vldb2012.pdf},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}