1. A.O.A.C., Official and Tentative Methods of Analysis. Sixth ed. pp. 119–120, (1945).
2. Chandler, R. F., Certain relationships between the calcium and oxalate content of certain forest trees. J. Agr. Research55, 393–396 (1907).
3. Duncan, D. B., Multiple range and multiple F tests. Biometrics11, 1–42 (1955).
4. Evans, H. J. and Troxler, R. V., Relation of calcium nutrition to the incidence of blossom-end rot in tomatoes. Am. Soc. Hort. Sci. Proc.61, 346–352 (1953).
5. Hoagland, D. R. and Arnon, D. I., The water-culture method for growing plants without soil. California Agr. Exp. Sta. Circ.347 (1950).