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Aequationes mathematicae > 2018 > 92 > 4 > 641-647
Computers and Mathematics with Applications > 2011 > 61 > 9 > 2578-2587
Journal of Applied Analysis > 2009 > Vol. 15, nr 2 > 269-280
Annales UMCS, Mathematica > 2008 > 62 > 1 > 15-29