1. Alexander, A. G., Sucrose-enzyme relationships in immature sugar cane as affected by variable nitrate and potassium supplied in sand culture. J. Agr. Univ. P. R. 48 (3), 165?231 (1964).
2. Alexander, A. G., Comparative studies of yeasts and sugar cane invertase. J. Agr. Univ. P.R. 53 (1), 41?56 (1969).
3. Ayres, A. S., Calcium silicate slag as a growth stimulant on low silicon soils. Soil Sci. 101, 216?227 (1966).
4. Bandurski, R. S. and Axelrod, B., chromatography of biologically important esters. J. Biol. Chem. 193, 404?410 (1952).
5. Bieleski, R. L. and Young, R. E., Extraction and separation of phosphate esters from plant tissues. Anal. Biochem. 6, 54?68 (1963).