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Science China Mathematics > 2011 > 54 > 7 > 1491-1498
Graphs and Combinatorics > 2010 > 26 > 6 > 805-813
Acta Mathematicae Applicatae Sinica, English Series > 2005 > 21 > 1 > 67-76
Acta Mathematicae Applicatae Sinica, English Series > 2005 > 21 > 1 > 67-76