Griesmer, J. H.; Jenks, R. D. "SCRATCHPAD/1: An interactive facility for symbolic mathematics"

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

Languages mentioned Scratchpad {1971} General purpose interactive symbolic maths system SCRATCHPAD/1 {1971}