@article{JMLR:v18:15-586,
  author  = {Shao-Bo Lin and Xin Guo and Ding-Xuan Zhou},
  title   = {Distributed Learning with Regularized Least Squares},
  journal = {Journal of Machine Learning Research},
  year    = {2017},
  volume  = {18},
  number  = {92},
  pages   = {1--31},
  url     = {http://jmlr.org/papers/v18/15-586.html}
}