[ACM] CACM 14(08) August 1971

(1957) Communications of the ACM  

Barton, D. and Fitch, J.P. (1971) Barton, D. and Fitch, J.P. "General Relativity and the Application of Algebraic Manipulative Systems" Moses, Joel (1971) Moses, Joel "Algebraic simplification: a guide for the perplexed" Moses, Joel (1971) Moses, Joel "Symbolic integration: the stormy decade"