@article{JMLR:v17:13-210,
  author  = {Wei Qian and Yuhong Yang},
  title   = {Kernel Estimation and Model Combination in A Bandit Problem with Covariates},
  journal = {Journal of Machine Learning Research},
  year    = {2016},
  volume  = {17},
  number  = {149},
  pages   = {1--37},
  url     = {http://jmlr.org/papers/v17/13-210.html}
}