@inproceedings{ijcai2009p171,
  title     = {Locality Preserving Nonnegative Matrix Factorization},
  author    = {Cai, Deng and He, Xiaofei and Wang, Xuanhui and Bao, Hujun and Han, Jiawei},
  booktitle = {Proceedings of the Twenty-First International Joint Conference on
               Artificial Intelligence, {IJCAI-09}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Hiroaki Kitano},
  pages     = {1010--1014},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/171},
}