Here we show that the main results in the papers by Yalcinkaya (2008), Yalcinkaya and Cinar (2010), and Yalcinkaya, Cinar, and Simsek (2008), as well as a conjecture from the last mentioned paper, follow from a slight modification of a result by G. Papaschinopoulos and C. J. Schinas. We also give some generalizations of these results.
"On Some Symmetric Systems of Difference Equations." Abstr. Appl. Anal. 2013 1 - 7, 2013. https://doi.org/10.1155/2013/246723