Susanti, W., B. Purwanto, R. Cilmiaty, and A. Prayitno. “Investigation of Astaxanthin Effect on the Formation of Collagen Fibers for Periodontal Tissue Repair in Bacteria Infected Periodontitis”. Bali Medical Journal, vol. 9, no. 2, Aug. 2020, pp. 493-5, doi:10.15562/bmj.v9i2.1770.