1. Historical land use change has lowered terrestrial silica mobilization
2. J. F. Ma and E. Takahashi, Soil, Fertilizer and Plant Silicon Research in Japan (Elsevier, Amsterdam, 2002).
3. The Terrestrial Silica Pump
4. E. M. Carlisle, J. A. McKeague, R. Siever, P. J. Van Soest, Silicon. In Geochemistry and the Environment (Elsevier: Washington, DC, 1977) Volume 2.
5. Uptake of Monosilicic Acid by Trifolium Incarnatum (L.)