Semiring-Based Soft Constraints. Bistarelli, S. & Rossi, F. In Degano, P., Nicola, R. D., & Meseguer, J., editors, Concurrency, Graphs and Models, Essays Dedicated to Ugo Montanari on the Occasion of His 65th Birthday, volume 5065, of Lecture Notes in Computer Science, pages 155–173, 2008. Springer.
Semiring-Based Soft Constraints [link]Paper  doi  bibtex   
@inproceedings{DBLP:conf/birthday/BistarelliR08,
  author       = {Stefano Bistarelli and
                  Francesca Rossi},
  editor       = {Pierpaolo Degano and
                  Rocco De Nicola and
                  Jos{\'{e}} Meseguer},
  title        = {Semiring-Based Soft Constraints},
  booktitle    = {Concurrency, Graphs and Models, Essays Dedicated to Ugo Montanari
                  on the Occasion of His 65th Birthday},
  series       = {Lecture Notes in Computer Science},
  volume       = {5065},
  pages        = {155--173},
  publisher    = {Springer},
  year         = {2008},
  url          = {https://doi.org/10.1007/978-3-540-68679-8\_11},
  doi          = {10.1007/978-3-540-68679-8\_11},
  timestamp    = {Tue, 23 Jan 2024 00:00:00 +0100},
  biburl       = {https://dblp.org/rec/conf/birthday/BistarelliR08.bib},
  bibsource    = {dblp computer science bibliography, https://dblp.org}
}

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