1. Altman A and Bachrach U (1981) Involvement of polyamines in plant growth and senescence. In: Caldarera CM, Zappia U and Bachrach U, eds. Advances in Polyamine Research, Vol 13, pp 365?375. New-York: Raven Press
2. Bachrach U (1973) Function of Naturally Occurring Polyamines, pp 40?120. New York: Academic Press
3. Bagni N (1970) Metabolic changes of polyamines during the germination of Phaseolus vulgaris. New Phytol 69:159?164
4. Bagni N and Serafini Fracassini D (1973) The role of polyamines as growth factors in higher plants and their mechanisms of action. Int Plant Growth Substances, pp 1205?1207. Tokyo: Hirokawa
5. Bagni N, Calzoni GL and Speranza A (1978) Polyamines as sole nitrogen sources for Helianthus tuberosus explants in vitro. New Phytol 80:317?323