Daniel C. S. Lim and  Eric Y. M. Yeo and  W. Y. Tan ,  Combinatory Nutrition Supplementation: A Case of Synergy for Increasing Calcium Bioavailability.   journal   = {International Journal of Nutrition and Food Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 122(2). 180 - 185
    [viewed 23 February 2020]. Available from: https://publications.waset.org/pdf/10006471.