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- [23] On the system of rational difference equations xn+1 = f(xn,yn-k), yn+1 = f(yn, xn-k) Advances in Difference Equations, 2006
- [26] On the difference equation Yn+1=Yn-(2k+l)+P/Yn-(2k+l)+QYn-2l PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON DIFFERENCE EQUATIONS: NEW PROGRESS IN DIFFERENCE EQUATIONS, 2004, : 433 - 452