Media type: E-Article Title: Programming Languages and Systems: Soft Concurrent Constraint Programming Contributor: Bistarelli, Stefano; Montanari, Ugo; Rossi, Francesca imprint: Springer Berlin Heidelberg, 2002 Published in: Programming Languages and Systems Language: Not determined DOI: 10.1007/3-540-45927-8_5 ISSN: 0302-9743 Origination: Footnote: