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APPLIED MATHEMATICS LETTERS, vol. 21, no. 12, page. 1306 - 1309, 2008-12

APPLIED MATHEMATICS LETTERS, vol. 21, no. 6, page. 545 - 548, 2008-06

APPLIED MATHEMATICS LETTERS, vol. 22, no. 10, page. 1604 - 1608, 2009-10

APPLIED MATHEMATICS LETTERS, vol. 22, no. 2, page. 159 - 162, 2009-02

APPLIED MATHEMATICS LETTERS, vol. 17, no. 1, page. 89 - 94, 2004-01