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Applied Mathematics Letters 25 (2012) 843-846
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Rendiconti del Circolo Matematico di Palermo 60 (2011) 323-327
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Applied Mathematics Letters 23 (2010) 498-502
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Expositiones Mathematicae 28 (2010) 71-77
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Numerical Functional Analysis and Optimization 30 (2009) 825-832
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Journal of Mathematical Analysis and Applications 345 (2008) 719-724
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