@article{pqkmeansbillionscaleclusteringfor,
  title = {PQk-means: Billion-scale Clustering for Product-quantized Codes},
  author = {Yusuke Matsui and Keisuke Ogaki and Toshihiko Yamasaki and Kiyoharu Aizawa},
  year = {2017},
  eprint = {1709.03708},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1709.03708v1},
}