DISCRETE MATHEMATICS, vol. 308, no. 14, page. 2925 - 2925, 2008-07-28
DISCRETE MATHEMATICS, vol. 308, no. 18, page. 4057 - 4068, 2008-09-28
DISCRETE MATHEMATICS, vol. 308, no. 18, page. 4116 - 4123, 2008-09-28
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