Rizqi Ananda Putri, Nafi’ah, and Sarianoferni. “The Differences Between Giving Topical Therapy of Extract Etanol 96% and 70% Spirulina Platensis on Density of Collagen Fiber in Traumatic Ulcer Healing”. DENTA JURNAL KEDOKTERAN GIGI, vol. 13, no. 1, Aug. 2021, pp. 25-33, https://journal-denta.hangtuah.ac.id/index.php/jurnal/article/view/55.