1. J.D. Smith, in: R.L. Hilderbrand (Ed.), The Role of Phosphonates in Living Systems, CRC: Boca Raton, FL, 1983, pp. 31–53.
2. K.A. Conrad, S.M. Lee, Clin. Pharmacol. Ther. 30(1981) 114.
3. G.B. Kasting, M.D. Francis, J. Bone, Miner, Res. 7 (1992) 513.
4. G. Silvestrini, N. Zini, P. Sabatelli, P. Mocetti, N.M. Maraldi, E. Bonucci, Bone 18 (1996) 559.
5. A.N. Pudovik, I.V. Konovalova, Synthesis (1979) 81.