1. Camenisch, J., 1998. Group signature schemes and payment systems based on the discrete logarithm problem, In: Maurer, U. (Ed.), ETH Series in Information Security and Cryptography, vol. 2, Hartung-Gorre Verlag Konstanz, pp. 11–12
2. New directions in cryptography;Diffie;IEEE Transactions on Information Theory,1976
3. A public-key cryptosystem and a signature scheme based on discrete logarithms;ElGamal;IEEE Transactions on Information Theory,1985
4. Kim, S., Park, S., Won, D., 1997. Proxy signatures, revisited, ICICS'97, Lecture Notes in Computer Science, Springer, Berlin, pp. 223–232
5. Lee, N.Y., Hwang, T., Wang, C.H., 1998. On Zhang's nonrepudiable proxy signature schemes. ACISP'98, Lecture Notes in Computer Science, Springer, Berlin, pp. 414–422