Y. Syamsuddin, H. Meilina, F. Septavia, and R. Darmawan, “Effect of Skimmed-Milk and Starter Addition on Lactic Acid Formation in Soyghurt”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 3, no. 4, pp. 314–317, Aug. 2013.