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Journal of Combinatorial Theory, Series B > 2016 > 121 > C > 85-145
Discrete Mathematics > 2001 > 230 > 1-3 > 13-21
IEEE Transactions on Computers > 1987 > C-36 > 5 > 619 - 623
IEEE Transactions on Computers > 1985 > C-34 > 1 > 33 - 45