S. Athikomkulchai, P. Vayumhasuwan, S. Tunvichien, S. Piyapong, S. Malaipuang, and N. Ruangrungsi, “The Development of Sunscreen Products from Kaempferia galanga”, J Health Res, vol. 21, no. 4, pp. 253–256, Nov. 2018.