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Mathematica Applicanda > 2017 > Vol. 45, No. 1 > 81--92
Mathematica Slovaca > 2010 > 60 > 6 > 751-770
Discrete Applied Mathematics > 2008 > 156 > 14 > 2793-2803
IEEE Transactions on Information Theory > 2006 > 52 > 7 > 3313 - 3319