Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Sten Andler, Predicate path expressions, Proceedings of the 6th ACM SIGACT-SIGPLAN symposium on Principles of programming languages, p.226-236, January 29-31, 1979, San Antonio, Texas  [doi>10.1145/567752.567774]
	2	P. Brinch Hansen (1972), "A Comparison of Two Synchronizing Concepts", Acta Informatica 1, pp. 190-199.
	3	-- (1973), "A Reply to Comments on 'A Comparison of Two Synchronizing Concepts' ", Acta Informatica 2, pp 189-190.
	4	Per Brinch Hansen, Distributed processes: a concurrent programming concept, Communications of the ACM, v.21 n.11, p.934-941, Nov. 1978  [doi>10.1145/359642.359651]
	5	Roy H. Campbell , A. Nico Habermann, The specification of process synchronization by path expressions, Operating Systems, Proceedings of an International Symposium, p.89-102, April 23-25, 1974
	6	P. J. Courtois , F. Heymans , D. L. Parnas, Concurrent control with “readers” and “writers”, Communications of the ACM, v.14 n.10, p.667-668, Oct. 1971  [doi>10.1145/362759.362813]
	7	-- (1972) "Comments on 'A Comparison of Two Synchronizing Concepts' ", Acta Informatica 1, pp 375-376.
	8	A.N. Habermann (1975), "Path ~xpressions", Technical Report, Dept. of Computer Science, Carnegie Mellon Univ, Pittsburg, PA.
	9	C. Hewitt and R. Atkinson (1979), "Specification and Proof Techniques for Serializers" IEEE Trans on Software Engineering SE-5, pp. 10-23.
	10	C. A. R. Hoare, Monitors: an operating system structuring concept, Communications of the ACM, v.17 n.10, p.549-557, Oct. 1974  [doi>10.1145/355620.361161]
	11	C. A. R. Hoare, Communicating sequential processes, Prentice-Hall, Inc., Upper Saddle River, NJ, 1985
	12	John E. Hopcroft , Jeffrey D. Ullman, Introduction To Automata Theory, Languages, And Computation, Addison-Wesley Longman Publishing Co., Inc., Boston, MA, 1990

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