1. http://www.umanitoda.ca/institutes/fisheries/METAALICUS1.html .
2. http://sofia.usgs.gov/geer/posters/merc_cicle/ .
3. Yu. V. Vyazovetskiy, Ekolog. Sist. Prib., No. 10, 3 (2004).
4. Yu. V. Vyazovetskiy, RF Patent No. 2074017 (1993).
5. Yu. V. Vyazovetskiy, RF Patent No. 2074018 (1997).