K AL-HAKEIM, H. ., . R. . S.AL-ZABEBA, E. . GRULKE, and . E. . A. JAFFAR AL-MULLA. “Interaction Of Calcium Phosphate Nanoparticles With Human Chorionic Gonadotropin Modifies Secondary And Tertiary Protein Structure”. Nova Biotechnologica Et Chimica, vol. 14, no. 2, Dec. 2015, pp. 141–157, doi:10.1515/nbec-2015-0023.