@article{JMLR:v7:huang06a,
  author  = {Tzu-Kuo Huang and Ruby C. Weng and Chih-Jen Lin},
  title   = {Generalized Bradley-Terry Models and Multi-Class Probability Estimates},
  journal = {Journal of Machine Learning Research},
  year    = {2006},
  volume  = {7},
  number  = {4},
  pages   = {85--115},
  url     = {http://jmlr.org/papers/v7/huang06a.html}
}