Katzenelson, Jacob and Milgrom, Elie "A short presentation of the main features of AEPL - an extensible programming language"

[ISEL 1971] (1971) [ACM] SIGPLAN Notices 6(12) December 1971 Proceedings of the international symposium on Extensible languages Grenoble, France 1971  

Languages mentioned AEPL {1971} An Extensible Programming Language