ElGamal, Taher. "A public key cryptosystem and a signature scheme based on discrete logarithms." IEEE transactions on Information Theory 31, no. 4 (1985): 469-472.

ElGamal, Taher. "A Public-Key Cryptosystem and a Signature Scheme based on Discrete Logarithms." IEEE Transactions on Information Theory IT 31, no. 4 (1985): 469-472.