Singh, Mandeep, Sunny Kumar, Sunny Kumar, and Tushant Garg. “Credit Card Fraud Detection Using Hidden Markov Model”. International Journal of Engineering and Computer Science 8, no. 11 (December 1, 2019): 24878–24882. Accessed April 18, 2024. https://ijecs.in/index.php/ijecs/article/view/4386.