Concurrent Constraint Programming

• Semantic Foundations of Concurrent Constraint Programming
  Vijay Saraswat, Martin C. Rinard and Prakash Panangaden
  Proceedings of the Eighteenth Annual ACM Symposium on the Principles of Programming Languages, pp. 333-352
  Orlando, Florida January 1991
  

• Concurrent Constraint Programming
  Vijay Saraswat and Martin C. Rinard
  Proceedings of the Seventeenth Annual ACM Symposium on the Principles of Programming Languages, pp. 232-245
  San Francisco, California January, 1990