1. M. Rabin, Private Communication.
2. M. Fischer, Private Communication through M. Blum.
3. S. Goldwasser and S. Micali, Proofs with Untrusted Oracles, Department of Computer Science MIT and Department of Computer Science University of Toronto, 1983.
4. M. Blum, “Coin Flipping by Telephone,” Proc. IEEE COMPCON, pp. 133–137, 1982.