1. Armstrong, D.J., Burrows, W.J., Evans, P.K., Skoog, F.: Isolation of cytokinins from tRNA. Biochem. Biophys. Res. Commun. 37, 451?456 (1969)
2. Beever, J.E., Woolhouse, H.W.: Increased cytokinin export from the roots of Perilla fructescens following disbudding or floral induction. In: Mechanisms of regulation of plant growth. Bieleski, R.L., Ferguson, A.R., Cresswell, M.M., eds. Bulletin 12. Royal Soc. of N.Z. Wellington, 681?686 (1974)
3. Burrows, W.J., Carr, D.J.: Effects of flooding the root system of sunflower plants on the cytokinin content in the xylem sap. Physiol Plant. 22, 1105?1112 (1969)
4. Chibnall, A.C.: Protein metabolism in the plant. New Haven: Yale University Press 1939
5. Chibnall, A.C.: Protein metabolism in rooted runner bean leaves. New Phytol. 53, 31?37 (1954)