Pham, N., H. Ma, and D. Pham. “ASSESSING YOGURT FERMENTATION ABILITY FROM COW MILK ADDED SOURSOP PUREE”. TRA VINH UNIVERSITY JOURNAL OF SCIENCE, Vol. 8, no. 32, Dec. 2018, pp. 68-76, doi:10.35382/18594816.1.32.2018.61.