MathSciNet bibliographic data MR2770220 39A22 Sun, Taixiang; Xi, Hongjian; He, Qiuli On boundedness of the difference equation $x_{n+1}=p_n+\frac{x_{n-3s+1}}{x_{n-s+1}}$$x_{n+1}=p_n+\frac{x_{n-3s+1}}{x_{n-s+1}}$ with period-$k$$k$ coefficients. Appl. Math. Comput. 217 (2011), no. 12, 5994–5997. Article

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