HEMAPRIYA, T; S. ARCHANA, K; ANUPRIYA, T. Comparison of preprocessing techniques for coin recognition using image processing methods. International Journal of Engineering and Technology, [S. l.], v. 7, n. 2.21, p. 351–354, 2018. DOI: 10.14419/ijet.v7i2.21.12405. Disponível em: https://mail.sciencepubco.com/index.php/IJET/article/view/12405.. Acesso em: 3 jun. 2025.