1. G. Aguzzi and R. Pinzani, On a Formalization of a Storage Allocation Mechanism for Fortran, Instituto di Elaborazione dell’Informazione, Report 11–70, Pisa (June 1968).
2. A. V. Aho and J. D. Ullman, The Theory of Languages, Math. Systems Theory
2, 97–125 (1968).
3. K. Alber and P. Oliva, Translation of Pl/I into Abstract Syntax, Technical Report TR 25.086, IBM Laboratory, Vienna (June 1968).
4. K. Alber, P. Oliva, and G. Urschler, Concrete Syntax of Pl/I, Technical Report TR 25.084, IBM Laboratory, Vienna (June 1968).
5. C. D. Allen, D. Beech, J. E. Nicholls, and R. Rowe, An Abstract Interpreter of PL/I, Tech. Note 3004, IBM Hursley Laboratories (November 1966).