U. Laila, R. Rochmadi, and S. Pudjiraharti, “Microencapsulation of Purple-Fleshed Sweet Potato Anthocyanins with Chitosan-Sodium Tripolyphosphate by Using Emulsification-Crosslinking Technique”, J. Math. Fund. Sci., vol. 51, no. 1, pp. 29-46, Apr. 2019.