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N. Beldiceanu and E. Contejean
Introducing Global Constraints in CHIP
Journal of Mathematical and Computer Modelling 20(12), 97-123, 1994

P. Van Hentenryck
Scheduling and Packing in the Constraint Language cc(FD)
Intelligent Scheduling, 1994

A. Aggoun and N. Beldiceanu
Extending CHIP in Order to Solve Complex Scheduling Problems
Journal of Mathematical and Computer Modelling 17(7), 57-73, 1993

C.J. Bouwkamp and A.J.W. Duijvestijn
Catalogue of Simple Perfect Squared Squares of orders 21 through 25
Technical Report 92 WSK 03, Eindhoven University of Technology, Department of Mathematics and Computer Science, nov 1992

J. H. Lint and R.M. Wilson
A Course in Combinatorics
Cambridge University Press

H. T. Croft, K.J. Falconer, and R.K. Guy
Unsolved Problems in Geometry
Springer New York

A.J.W. Duijvestijn
Simple Perfect Squared Square of Lowest Order
Journal of Combinatorial Theory, Series B, 555-558, 1978