@inproceedings{liu2019hydra,
  title     = {{Hydra}: A Personalized and Context-Aware Multi-Modal Transportation Recommendation System},
  author    = {Liu, Hao and Tong, Yongxin and Zhang, Panpan and Lu, Xinjiang and Duan, Jianguo and Xiong, Hui},
  booktitle = {Proceedings of the 25th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining},
  year      = {2019},
  doi       = {10.1145/3292500.3330660},
  url       = {https://doi.org/10.1145/3292500.3330660}
}