Michael Ben-Or, Oded Goldreich, Silvio Micali, Ronald L. Rivest. A Fair Protocol for Signing Contracts (Extended Abstract). In Wilfried Brauer, editor, Automata, Languages and Programming, 12th Colloquium, Nafplion, Greece, July 15-19, 1985, Proceedings. Volume 194 of Lecture Notes in Computer Science, pages 43-52, Springer, 1985.
Abstract is missing.