1. Uranium-Series Disequilibrium: Applications to Earth, Marine and Environmental Sciences;Ivanovich,1992
2. C.R. Cothern, P.A. Rebers (1992), Radon, radium and uranium in drinking water Lewis Publisher (1990).
3. The environmental behaviour of radium;IAEA,1990
4. Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption;European Union;Official Journal L,1998
5. Decreto Legislativo 2 febbraio 2001, n. 31. Attuazione della direttiva 98/83/CE relativa alle acque destinate al consumo umano, Supplemento ordinario alla G.U. n. 52, 3 marzo 2001 (in Italian).