Zainoldin and  K.H. and  Baba and  A.S.,  The Effect of Hylocereus polyrhizus and Hylocereus undatus on Physicochemical, Proteolysis, and Antioxidant Activity in Yogurt.   journal   = {International Journal of Nutrition and Food Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2009, vol. 36(12). 585 - 590
    [viewed 25 January 2020]. Available from: https://publications.waset.org/pdf/12142.