1. ISO 9241–11: Ergonomic requirements for office work with visual display terminals (VDTs) - Part 11: Guidance on usability. International (1998)
2. Apt, K.R., Wallace, M.: Constraint Logic Programming Using Eclipse. Cambridge University Press, New York (2007)
3. Carlsson, M., Mildner, P.: Sicstus prolog - the first 25 years. CoRR abs/1011.5640 (2010)
4. choco Team. choco: an open source Java constraint programming library. Research report 10-02-INFO, École des Mines de Nantes (2010)
5. Lecture Notes in Computer Science;M Dincbas,1988