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Applied Mathematics and Computation > 2012 > 218 > 9 > 4860-4866
Applied Mathematics Letters > 2011 > 24 > 11 > 1845-1848
Fixed Point Theory and Applications > 2011 > 2011 > 1 > 1-17
Applied Mathematics and Computation > 2009 > 210 > 2 > 542-550