@article{JMLR:v17:15-389,
  author  = {Steve Hanneke},
  title   = {The Optimal Sample Complexity of PAC Learning},
  journal = {Journal of Machine Learning Research},
  year    = {2016},
  volume  = {17},
  number  = {38},
  pages   = {1--15},
  url     = {http://jmlr.org/papers/v17/15-389.html}
}