biomine.brgm.fr/
www.desline.com
www.environmental-expert.com
www.ewp.eu
www.nwp.nl
www.mopaq.nl
www.uasb.org
www.myvespucci.com
www.waterforum.net
www.water.startpagina.nl
wikipedia / biological sulfide production
www.wetsus.nl
