1. G. Rossi Osmida; Archeo 58, 62–111 (1989).
2. E. David, I costruttori delie piramidi, Einaudi, Torino (1989).
3. M. Neuberger, History of Medicine, Bedford Medical Publications, London (1910).
4. L. Sterpellone, Dagli del al DNA, Antonio Delfino Editore, Torino (1988).
5. T.U. Hoogenraad, Trace Elements in Medicine 1, 47–49 (1984).