@article{SawadeBickelvonOertzenetal.2013,
  author    = {Christoph Sawade and Steffen Bickel and Timo von Oertzen and Tobias Scheffer and Niels Landwehr},
  title     = {Active evaluation of ranking functions based on graded relevance},
  journal   = {Machine learning},
  volume    = {92},
  number    = {1},
  pages     = {41 -- 64},
  doi       = {10.1007/s10994-013-5372-5},
  year      = {2013},
}