@InProceedings{	  inp:HuKhanBaiZhang2012,
  author	= {Jinwei Hu and Khaled M. Khan and Yun Bai and Yan Zhang},
  title		= {Compliance Checking for Usage-Constrained Credentials in
		  Trust Negotiation Systems},
  booktitle	= {Proceedings of the 15th Information Security Conference
		  (ISC)},
  year		= 2012,
  pages		= {290--305},
  publisher	= {Springer}
}