Production of Abrasive Sandpaper using Periwinkle Shells and Crab Shells. International Journal of Engineering Materials and Manufacture, [S. l.], v. 5, n. 2, p. 55–61, 2020. DOI: 10.26776/ijemm.05.02.2020.04. Disponível em: https://www.deerhillpublishing.com/index.php/ijemm/article/view/130. Acesso em: 19 sep. 2025.