J. G. Mitchell, Alan J. Perlis, H. Van Zoeren. 2: a language for conversational computing. In Melvin Klerer, Juris Reinfelds, editors, Proceedings of the ACM Symposium on Interactive Systems for Experimental Applied Mathematics, Washington, D.C., USA, August 1, 1967. pages 203-214, ACM, 1967. [doi]
Abstract is missing.