Devi Kakarla, V. Uma Karuna, and CH. Suneetha. “Novel Approach for Encryption Using Catalan Numbers”. International Journal of Intelligent Systems and Applications in Engineering 11, no. 4 (September 21, 2023): 209–214. Accessed July 12, 2025. https://ijisae.org/index.php/IJISAE/article/view/3514.