Mutual Recursion in Algol 60 Using Restricted Compilers CACM January, 1973 Atkins,M. S. Algol 60, mutual recursion, compiler restrictions 4.12 4.22 CA730110 JB January 24, 1978 3:46 PM 2551 5 2551 2551 5 2551 2551 5 2551 2658 5 2551 2551 6 2551