@inproceedings{skillcharacterizationbasedonbetweenness,
  title = {Skill Characterization Based on Betweenness},
  author = {Özgür Şimşek and Andrew G. Barto},
  year = {2008},
  booktitle = {NeurIPS 2008 12},
  url = {http://papers.nips.cc/paper/3411-skill-characterization-based-on-betweenness},
}