1. Quality in Roughages. I. Factors Which Influence Hay Composition and Quality;Archibald;J. Dairy Sci.,1951
2. Association of Official Agricultural Chemists. Official Methods of Analysis. 8th ed. p. 363, 1,008 pp., Washington, D. C. 1955.
3. Ibid., p. 544.
4. Inhibition of Photosynthesis by Intense Light;Kok;Biochim. et Biophys. Acta,1956
5. Light Adaptation of Citrus Plants;Nekrasova;Biochim. et Biophys. Acta,1956