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Advances in Difference Equations > 2015 > 2015 > 1 > 1-13
Applicationes Mathematicae > 2000 > 27 > 2 > 187-196
Applicationes Mathematicae > 1997 > 24 > 4 > 445-455
Journal of Computational and Applied Mathematics > 1996 > 69 > 1 > 159-170