Abu-Shandi, Khalid, Engelbert Redel, Fadel Al-Wedian, Eyad Abu-Nameh, Hamdan Al-Ebaisat, and Abla Alzagameem. 2010. “Synthesis, Characterization and Crystal Structure of Calcium-3-Amino-1-Hydroxypropylidene-1,1-Bisphosphonic Acid”. Asian Journal of Chemistry 22 (2):1307-14. https://asianpubs.org/index.php/ajchem/article/view/11264.