title={Learning to Collaborate: Multi-Scenario Ranking via Multi-Agent Reinforcement Learning},
  author={Feng, Jun and Li, Heng and Huang, Minlie and Liu, Shichen and Ou, Wenwu and Wang, Zhirong and Zhu, Xiaoyan},
  booktitle={Proceedings of the 2018 World Wide Web Conference on World Wide Web},
  organization={International World Wide Web Conferences Steering Committee}