Niyomsujarit, Nattawit, Apakorn Worahan, and Munin Chaichalothorn. 2021. “Effects of cyclic acid challenge on the surface roughness of various flowable resin composites”. Mahidol Dental Journal 41 (3). Bangkok, Thailand:187-96. https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/250896.