Tobias Müller and 
   Jörg Würtz. Extending a Concurrent Constraint Language by Propagators.  In 
   J. Maluszynski editor,  International Logic Programming Symposium (ILPS '97), October 12-17, Pages 149-163, MIT Press, Port Jefferson, Long Island N.Y., USA,   1997.   [Abstract]      google  [Annote]
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