(1)
Elabbasy, E. M.; El-Metwally, H.; Elsayed, E. On the Difference Equation ${ x_{n+1}=\frac{ax_{n}^{2}+bx_{n-1}x_{n-k}}{cx_{n}^{2}+dx_{n-1}x_{n-k}}}$. sjm 2024, 4, 239-248.