Weerapol, Y., K. Cheewatanakornkool, and P. Sriamornsak. “Impact of Gastric PH and Dietary Fiber on Calcium Availability of Various Calcium Salts”. Science, Engineering and Health Studies, vol. 4, no. 1, Mar. 2013, pp. 15-23, doi:10.14456/sustj.2010.2.