@inproceedings{IJCAI15,
  title = "Envy-free sponsored search auctions with budgets",
  author = "Tang, Bo and Zhang, Jinshan",
  year = "2015",
  booktitle = "Proceedings of the 24th International Conference on Artificial Intelligence",
  pages = "653--659",
  publisher = "AAAI Press",
  series = "IJCAI'15",
}