V. Sinyev, L. Levchenko, G. Toxseitova, E. Sakhipov, BatyrbayevaА., and ТоktabayevaА., “Dehydration of amorphous calcium-magnesium phosphate by air”, Chemical Bulletin of Kazakh National University, vol. 73, no. 1, pp. 60-68, Apr. 2014.