1. 1D. B. Hawkins , Experimental Hydrothermal Studies Bearing on Rock Weathering and Clay Mineral Formation "; Ph.D. thesis in geochemistry, The Pennsylvania State University, 1961 .
2. 2A. J. Majumdar , "Applicability of Classical Thermodynamics to Solid-Solid Transitions "; Ph.D. thesis in geochemistry , The Pennsylvania State University, 1958 .
3. 4R. K. Iler , Colloid Chemistry of Silica and Silicates , p.182 . Cornell University Press, Ithaca, N. Y., 1955 . 182 pp.Ceram. Abstr., 1955 , p.182 .
4. A portion of the system silica-water