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Mediterranean Journal of Mathematics > 2014 > 11 > 3 > 873-880
Applications of Mathematics > 2011 > 56 > 1 > 137-160
Nonlinear Analysis > 2010 > 73 > 9 > 3069-3082
Nonlinear Differential Equations and Applications NoDEA > 2010 > 17 > 1 > 69-93
Nonlinear Analysis > 2003 > 54 > 5 > 995-1010