1. J. Fawell, K. Bailey, J. Chilton, E. Dahi, L. Fewtrell and Y. Magara, Fluoride in Drinking-water, IWA Publishing London, World Health Organization (WHO), 2006.
2. Combination of membrane technology and limestone filtration to control drinking water quality;Kettunen;Desalination,2000
3. Groundwater use and policy in community water supply in Finland;Katko;Hydrogeology J.,2006
4. Fresh water adds to quality of life, Brochure, Kymenlaakso Water Ltd, Kotka, Finland, 2001.
5. FTNORM normalization software, can be downloaded from www.dow.com/liquidseps/design/ft_norm.htm