@Article{RyoWatanabe:2017,
  author = {Ryo Watanabe, Junpei Komiyama, Atsuyoshi Nakamura, Mineichi Kudo},
  title = {KL-UCB-Based Policy for Budgeted Multi-Armed Bandits with Stochastic Action Costs},
  booktitle = {IEICE Transactions},
  year      = {2017},
  pages     = {2470-2486},
}