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Acta Mathematica Scientia > 2014 > 34 > 5 > 1446-1460
Computers and Mathematics with Applications > 2004 > 47 > 10-11 > 1667-1672
Acta Mathematica Scientia > 2014 > 34 > 5 > 1446-1460
Computers and Mathematics with Applications > 2004 > 47 > 10-11 > 1667-1672