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Mediterranean Journal of Mathematics > 2016 > 13 > 6 > 5163-5176
Nonlinear Analysis: Real World Applications > 2014 > 20 > Complete > 14-20
Afrika Matematika > 2012 > 23 > 1 > 85-97
Indagationes Mathematicae > 2011 > 22 > 1-2 > 103-115
Applied Mathematics and Computation > 2009 > 215 > 3 > 1161-1169
Applied Mathematics Letters > 2008 > 21 > 6 > 549-553