Dr. Anusiuba Overcomer Ifeanyi Alex, Okechukwu Ogochukwu Patience, Ekwealor Oluchukwu Uzoamaka, and Anusiuba Amarachukwu Angela. “The Application of Hidden Markov Model in Credit Card Fraud Detection System”. iJournals:International Journal of Software & Hardware Research in Engineering ISSN:2347-4890, vol. 10, no. 2, Feb. 2022, https://ijournals.in/journal/index.php/ijshre/article/view/85.