1. Lecture Notes in Computer Science;P. America,1987
2. America, P.: Designing an object-oriented programming language with behavioural subtyping. In: de Bakker, J. W., de Roever, W. P., Rozenberg, G. (eds) Foundations of Object-Oriented Languages, REX School/Workshop, Noordwijkerhout, The Netherlands, May/June 1990, volume 489 of Lecture Notes in Computer Science, pages 60–90. Springer, New York, N.Y., 1991
3. America, P., de Boer, F.: A sound and complete proof theory for SPOOL. Technical Report 505, Philips Research Laboratories, Nederlandse Philips Bedrijven B. V., 1990
4. Broy, M.: A theory for nondeterminism, parallelism, communication, and concurrency. Theoretical Computer Science 45(1):1–61, 1986
5. Bruce, K. B., Longo, G.: A modest model of records, inheritance, and bounded quantification. In Gurevich, Y. (ed.) Third Annual Symposium on Logic in Computer Science, pages 38–51. IEEE, 1988