1. Lecture Notes in Computer Science;S.S. Al-Riyami,2003
2. Bakker, A., Steen, M., Tanenbaum, A.S.: A Law-abiding Peer-To-Peer Network for Free-Software Distribution. In: Proceedings of NCA 2001, pp. 60–67. IEEE Computer Society Press, Los Alamitos (2001)
3. Boldyreva, A., Palacio, A., Warinschi, B.: Secure Proxy Signature Schemes for Delegation of Signing Rights. Cryptography ePrint Archive,
http://eprint.iacr.org/2003/096
4. Lecture Notes in Computer Science;J. Cha,2002
5. Lecture Notes in Computer Science;S.S.M. Chow,2005