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Mathematical and Computer Modelling > 2011 > 54 > 9-10 > 2007-2013
Nonlinear Analysis: Real World Applications > 2008 > 9 > 4 > 1661-1671
Applied Mathematics Letters > 2007 > 20 > 7 > 729-733
Nonlinear Analysis: Real World Applications > 2007 > 8 > 2 > 680-687