NGO, SIN LING, and SHAHMIR HAYYAN SANUSI. “Abrasion Effects Between Cockle Shell Waste Particles and Perlite Particles in Teeth Cleaning”. Research Progress in Mechanical and Manufacturing Engineering, vol. 3, no. 1, Aug. 2022, pp. 306-19, https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/3848.