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Discrete Mathematics > 2000 > 214 > 1-3 > 173-191
Designs, Codes and Cryptography > 1999 > 17 > 1-3 > 299-303
Discussiones Mathematicae Graph Theory > 1996 > 16 > 2 > 181-195
Journal of Algebraic Combinatorics > 1996 > 5 > 3 > 191-244