Giles Peterson and Aaron B. Budgor "The computer language Mathsy and applications to solid state physics"

[ACM] (1980) [ACM] CACM 23(08) August 1980  

Languages mentioned LG {1969} Mathsy {1980} Interactive mathematics and graphics Speakeasy {1971} Interactive expression-oriented language with plugins SPEAKEASY 3 {1972} Version 3 of Speakeasy