Niamah, Alaa. “Ultrasound Treatment (low Frequency) Effects on Probiotic Bacteria Growth in Fermented Milk”. Future of Food: Journal on Food, Agriculture and Society 7, no. 2 (December 18, 2019): Article Nr. 103. Accessed August 5, 2020. http://thefutureoffoodjournal.com/index.php/FOFJ/article/view/172.