@article{DBLP:journals/dke/AfratiLL08,
  author    = {Foto N. Afrati and
               Paraskevas V. Lekeas and
               Chen Li},
  title     = {Adaptive-sampling algorithms for answering aggregation queries
               on Web sites},
  journal   = {Data Knowl. Eng.},
  volume    = {64},
  number    = {2},
  year      = {2008},
  pages     = {462-490},
  ee        = {http://dx.doi.org/10.1016/j.datak.2007.09.014},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}