Ekantari, Nurfitri, et al. “Calcium of Spirulina Platensis Has Higher Bioavailability Than Those of Calcium Carbonate and High-Calcium Milk in Sprague Dawley Rats Fed With Vitamin D-Deficient Diet”. Pakistan Journal of Nutrition, vol. 16, no. 3, Feb. 2017, pp. 179–186, https://doi.org/10.3923/pjn.2017.179.186.