Economic viability of phytoremediation of a cadmium contaminated agricultural area using energy maize. Part I: effect on the farmer's income., Thewys, T, Witters N, Van Slycken S, Ruttens Ann, Meers E, Tack F M. G., and Vangronsveld J , Int J Phytoremediation, 2010 Sep, Volume 12, Issue 7, (2010)