Petrick, S. R. "On the use of syntax-based translators for symbolic and algebraic manipulation"

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

Languages mentioned COGENT {1965} COmpiler and GENeralized Translator LPL {1970} List Programming Language