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JOURNAL OF DIFFERENTIAL EQUATIONS, vol. 250, no. 5, page. 2440 - 2461, 2011-03-01

INTERNATIONAL JOURNAL OF NUMBER THEORY, vol. 7, no. 5, page. 1379 - 1393, 2011-08

JOURNAL OF GEOMETRIC ANALYSIS, vol. 21, no. 2, page. 476 - 493, 2011-04

MATHEMATICAL AND COMPUTER MODELLING, vol. 53, no. 5-6, page. 952 - 963, 2011-03

JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, vol. 374, no. 1, page. 1 - 7, 2011-02-01

JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, vol. 373, no. 2, page. 464 - 474, 2011-01-15