1. Google LLC: Google OR-Tools (2019).
https://developers.google.com/optimization/
. Accessed 22 Nov 2019
2. Lecture Notes in Computer Science;Ö Akgün,2018
3. Boussemart, F., Hemery, F., Lecoutre, C., Sais, L.: Boosting systematic search by weighting constraints. In: de Mántaras, R.L., Saitta, L. (eds.) Proceedings of the 16th European Conference on Artificial Intelligence (ECAI 2004), including Prestigious Applicants of Intelligent Systems (PAIS 2004), Valencia, Spain, 22–27 August 2004, pp. 146–150. IOS Press (2004)
4. Dechter, R.: Constraint Processing. Elsevier Morgan Kaufmann, Burlington (2003)
5. Lecture Notes in Computer Science;L Hellsten,2004