[ACM] CACM 14(07) (July 1971).

(1957) Communications of the ACM  

Hall, A.D. (1971) Hall, A.D. "The ALTRAN System for Rational Function Manipulation A Survey" revision of SIGSAM paper Pratt, T. W.; Friedman, D. P.: A language extensio (1971) Pratt, T. W.; Friedman, D. P.: A language extension for graph processing and its formal semantics"