Jenks, R. D. "META LISP and META PLUS: Tools for rapidly implementing extendable language translators"

[SYMSAM 71] (1971) [ACM] Proceedings of the Second Symposium on Symbolic and Algebraic Manipulation, March 23-25, 1971 Los Angeles (SYMSAM 71)  

Languages mentioned LPL {1970} List Programming Language META/LISP {1970} META/PLUS {1971} SCRATCHPAD/1 {1971}