P, Rajiniganth, and Britto Antony Xavier G. “Advanced Fibonacci Sequence and Its Sum by Second Order Variable Co-Efficient Difference Operator”. Journal of Computational Mathematica 5, no. 2 (December 20, 2021): 92 - 101. Accessed September 23, 2023. https://shcpub.in/index.php/cm/article/view/200.