@inproceedings{optimalityforactivelearningongaussian,
  title = {Σ-Optimality for Active Learning on Gaussian Random Fields},
  author = {Yifei Ma and Roman Garnett and Jeff Schneider},
  year = {2013},
  booktitle = {NeurIPS 2013 12},
  url = {http://papers.nips.cc/paper/4951--optimality-for-active-learning-on-gaussian-random-fields},
}