Caporn, S.J.M., Brooks, A.L., Press, M.C. and Lee, J.A. 1999. Effects of long-term exposure to elevated CO2 and increased nutrient supply on bracken (Pteridium aquilinum). Functional Ecology 13: 107-155.

Zheng, J., Wang, H., Li, Z., Tang, S. and Chen, Z. 2008. Using elevated carbon dioxide to enhance copper accumulation in Pterdium revolutum, a copper-tolerant plant, under experimental conditions. International Journal of Phytoremediation 10: 161-172.