Ingerman, Peter Zilahy "A translation technique for languages whose syntax is expressible in extended Backus Normal Form"

(1962) Symbolic Languages in Data Processing, in the Proceedings of the Symposium organized and edited by the International Computation Centre, Rome, Italy, March 26­31, 1962, Gordon and Beech Science Publishers, 1962.   P Z Ingerman

Languages mentioned BNF {1959} Backus Naur Form Ingerman generalised BNF {1959}