Sophie Huczynska Paul McKay Ian Miguel Peter Nightingale Modelling Equidistant Frequency Permutation Arrays: An Application of Constraints to Mathematics. 50-64 2009 CP http://dx.doi.org/10.1007/978-3-642-04244-7_7 conf/cp/2009 db/conf/cp/cp2009.html#HuczynskaMMN09