1. International Council on Mining and Metals (ICMM). Projects: Mine Closure and Legacy. 2011. Available: http://www.icmm.com/our-work/projects/mineclosure.
2. PDAC and The Mining Association of Canada (MAC). Minalliance, 100 Innovations in the Mining Industry. 2012. Available: http://www.miningfacts.org/environment/what-happens-to-mine-sites-after-a-mine-is-closed/#sthash.0vCJNNo4.dpuf.
3. Phytoremediation of heavy metal-contaminated land by trees—a review;ID Pulford;Environment International,2002
4. The effect of patchy distribution of Stipa tenacissima on runoff and erosion;A Cerdà;Journal of Arid Environment,1997
5. Recent advances in Frankia physiology and biochemistry with notes on practical implications;J Schwencke;Microbial interactions in agriculture and forestry,1998