@article{<a href="http://dblp.uni-trier.de/db/about/bibtex.html">DBLP</a>:journals/pvldb/SelkeLB12,
  author    = {Joachim Selke and
               Christoph Lofi and
               Wolf-Tilo Balke},
  title     = {Pushing the Boundaries of Crowd-enabled Databases with Query-driven
               Schema Expansion},
  journal   = {PVLDB},
  volume    = {5},
  number    = {6},
  year      = {2012},
  pages     = {538-549},
  ee        = {http://vldb.org/pvldb/vol5/p538_joachimselke_vldb2012.pdf},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}