S. V. Zasukha, O. I. Guzyr, G. P. Gudz, and Y. G. Shermolovich, “The synthesis of bisphosphonate analogues of nucleotides – derivatives of (α-phenyl)(α-fluoro)methylenebisphosphonic acids”, J. Org. Pharm. Chem., vol. 12, no. 4(48), pp. 55–64, Dec. 2014.