@article{JMLR:v13:vanerven12a,
  author  = {Tim van Erven and Mark D. Reid and Robert C. Williamson},
  title   = {Mixability is Bayes Risk Curvature Relative to Log Loss},
  journal = {Journal of Machine Learning Research},
  year    = {2012},
  volume  = {13},
  number  = {52},
  pages   = {1639--1663},
  url     = {http://jmlr.org/papers/v13/vanerven12a.html}
}