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Applied Mathematics Letters > 2012 > 25 > 11 > 1936-1940
Applied Mathematics and Computation > 2009 > 215 > 4 > 1548-1552
Applied Mathematics Letters > 2012 > 25 > 11 > 1936-1940
Applied Mathematics and Computation > 2009 > 215 > 4 > 1548-1552