Pujarern, P., P. Rodanant, E. Warinsiriruk, and K. Rattanasuwan. “Evaluation of the optimum brushing force on dental plaque removal: an in vitro study”. Mahidol Dental Journal, vol. 41, no. 1, Apr. 2021, pp. 75-82, https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/247466.