1. Determination of pH. Theory and Practice;Bates,1973
2. pH standards of high acidity and high alkalinity and the practical scale of pH;Bates;J. Res. Natl Bur. Stand.,1950
3. Methods for Collection and Analysis of Water Samples for Dissolved Minerals and Gasses;Brown,1970
4. The pH values of soils suspended in dilute salt solutions;Clark,1966
5. The experimental chemical weathering of silicates;Correns;Clay Mineral Bull.,1961