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”, DJKG, vol. 13, no. 1, pp. 25–33, Aug. 2021.