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Applied Mathematics Letters > 2015 > 44 > Complete > 5-11
Open Mathematics > 2013 > 11 > 3 > 574-593
Central European Journal of Mathematics > 2013 > 11 > 3 > 574-593
Advances in Difference Equations > 2013 > 2013 > 1 > 1-32
Applied Mathematics Letters > 2015 > 44 > Complete > 5-11
Open Mathematics > 2013 > 11 > 3 > 574-593
Central European Journal of Mathematics > 2013 > 11 > 3 > 574-593
Advances in Difference Equations > 2013 > 2013 > 1 > 1-32