@inproceedings{learningeigenvectorsforfree,
  title = {Learning Eigenvectors for Free},
  author = {Wouter M. Koolen and Wojciech Kotlowski and Manfred K. Warmuth},
  year = {2011},
  booktitle = {NeurIPS 2011 12},
  url = {http://papers.nips.cc/paper/4377-learning-eigenvectors-for-free},
}