@article{JMLR:v18:16-601,
  author  = {Xiangyu Chang and Shao-Bo Lin and Ding-Xuan Zhou},
  title   = {Distributed Semi-supervised Learning with Kernel Ridge Regression},
  journal = {Journal of Machine Learning Research},
  year    = {2017},
  volume  = {18},
  number  = {46},
  pages   = {1--22},
  url     = {http://jmlr.org/papers/v18/16-601.html}
}