1. Basic safety standards no. 115,1995
2. Council Directive 98/83/EC (1998). Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption. Official Journal, L330/45, 05/12/1998.
3. The environmental behaviour of radium 1–2,1990
4. 226Ra and 222Ra concentrations and doses in bottled waters in Spain;Fernández;Journal of Environmental Radioactivity,1999
5. Recommendations,1993