@article{TOIS2016trip,
  title={Trip Recommendation Meets Real-World Constraints: POI Availability, Diversity, and Traveling Time Uncertainty},
  author={Zhang, Chenyi and Liang, Hongwei and Wang, Ke},
  journal={ACM Transactions on Information Systems (TOIS)},
  volume={35},
  number={1},
  pages={5},
  year={2016},
  publisher={ACM}
}