Andre Deprit, Jacques Henrard, Arnold Rom "Lunar ephemeris: De Launay's theory revisited" p342

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

Languages mentioned ESP {1970} Symbolic maths system