1. Abdennadher, S., Schlenker, H.: INTERDIP-an Interactive Constraint Based Nurse Scheduler. In: Proc. Int. Conf. on Practical Applications of Constraint Technology and Logic Programming. Practical Applications Expo, London (1999)
2. Bacchus, F., van Run, P.: Dynamic Variable Ordering in CSPs. In: Montanari, U., Rossi, F. (eds.): Proc. 1st Int. Conf. on Principles and Practice of Constraint Programming. Springer-Verlag, Berlin Heidelberg New York (1995) 258–275
3. Bistarelli, S., Fargier, H., Montanari, U., Rossi, F., Schiex, T., Verfaillie, G.: Semiring-Based CSPs and Valued CSPs: Basic Properties and Comparisons. In: Jampel, M. (ed.): Over-Constrained Systems. Springer-Verlag, Berlin Heidelberg NewYork (1996)
4. Borning, A., Freeman-Benson, B., Wilson, M.: Constraint Hierarchies. Lisp and Symbolic Comput. 5 (1992) 233–270
5. Darmoni, S.J., Fajner, A., Leforestier, A., Mahé, N.: Horoplan: Computer-Assisted Nurse Scheduling Using Constraint-Based Programming. J. Soc. for Health Systems 5 (1995) 41–54