Ranasinghe, JGS, and WTR Perera. 2016. “Prevalence of Lactobacillus Bulgaricus and Streptococcus Thermophilus Stability in Commercially Available Yogurts in Sri Lanka”. Asian Journal of Medical Sciences 7 (5):97-101. https://nepjol.info./index.php/AJMS/article/view/14326.