1. Brewer, G.J., Curr. Opin. Chem. Biol., 2003, vol. 7, p. 207.
2. http://www.hriptc.orc/zinc-deficiency.html .
3. http://www.epa.gov/safewater/mcl.html#mcls .
4. http://www.hc-sc.gc.ca/hecs-sesc/water/dwgsup.html ; http://www.epa.gov .
5. European Communities Council Directive 98/83/EC of November 3, 1998 on the Quality of Water Intended for Human Consumption, Off. J. Eur. Comm., L, 1998, vol. 330, no. 12, p. 0032.