@article{happytravelerstakebigpicturesa,
  title = {Happy Travelers Take Big Pictures: A Psychological Study with Machine Learning and Big Data},
  author = {Xuefeng Liang and Lixin Fan and Yuen Peng Loh and Yang Liu and Song Tong},
  year = {2017},
  eprint = {1709.07584},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1709.07584v1},
}