@article{permutationsearchmethodsareefficientyet,
  title = {Permutation Search Methods are Efficient, Yet Faster Search is Possible},
  author = {Bilegsaikhan Naidan and Leonid Boytsov and Eric Nyberg},
  year = {2015},
  eprint = {1506.03163},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1506.03163v4},
}