V. Muhardina, P. Meutia Sari, Y. Aisyah, S. Haryani, and F. Atul Mega, “Extrusion encapsulation of Lactobacillus bulgaricus coated by carrageenan – alginate with additional tofu waste flour prebiotic”, IJET, vol. 7, no. 4, pp. 5242–5244, Mar. 2019, doi: 10.14419/ijet.v7i4.24255.