1. P. America, F.S. de Boer: A proof system for a parallel programming language with dynamic process creation. Proceedings of the seventeenth International Colloquium on Automata, Languages and Programming, University of Warwick, England, July 16–20, 1990.
2. P. America, F.S. de Boer: A proof theory for a sequential version of POOL, C.W.I. Report, to appear.
3. ESPRIT project;P. America,1985
4. K.R. Apt: Formal justification of a proof system for CSP. Journal ACM, Vol. 30, No. 1, 1983, pp. 197–216.
5. K.R. Apt: Ten years of Hoare logic: a survey-part 1. Journal ACM, Vol. 3, No. 4, 1981, pp. 431–483.