Tiptimaphan, K., S. Chiaraputt, and A. Ritthiti. “Effects of coffee immersion on translucency of high-strength flowable composites under simulated toothbrushing condition: an in vitro study”. Mahidol Dental Journal, vol. 43, no. suppl, Oct. 2023, pp. S89-S96, https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/264763.