Purbolingga, Yoan, Ahmad Ridwan, and Dila Marta Putri. “A Machine Learning-Based Ambiguous Alphabet Recognition for Indonesian Sign Language System (SIBI)”. CogITo Smart Journal 11, no. 1 (June 30, 2025): 1–14. Accessed July 17, 2025. https://cogito.unklab.ac.id/index.php/cogito/article/view/816.