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Ghannam, N. , Khalil, A. and Asaad, M. 2018. Study the optimal conditions for the preparation of hydroxyapatite in the three-component system: Ca (NO3)2- (NH4)2HPO4- NH3.H2O to be used medically. Tishreen University Journal -Basic Sciences Series. 39, 5 (Oct. 2018).