@article{<a href="http://dblp.uni-trier.de/db/about/bibtex.html">DBLP</a>:journals/tods/BarceloLLW12,
  author    = {Pablo Barcel{\'o} and
               Leonid Libkin and
               Anthony Widjaja Lin and
               Peter T. Wood},
  title     = {Expressive Languages for Path Queries over Graph-Structured
               Data},
  journal   = {ACM Trans. Database Syst.},
  volume    = {37},
  number    = {4},
  year      = {2012},
  pages     = {31},
  ee        = {http://doi.acm.org/10.1145/2389241.2389250},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}