1. Adams, D. O. & S. F. Yang, Methionine Metabolism in Apple tissue, Plant Physiol, 60, 892–896 (1977).
2. Amrhein, N., D. Schneebeck, H. Skorupka, S. Pothof, and J. Stöckigt, Identification of a major metabolite of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid in higher plants, Naturwissenschaften, 68, 619–620 (1981).
3. Austin, G. N., P. D. Baird, H. Chow, L. E. Fellows, G. W. J. Fleet, R. J. Nash, J. M. Peach, R. J. Pryce, and C. H. Stirton, Isolation from Atelia Herbert-smithii Pittier (Sophoreae, Leguminosae) and x-ray structure of cis-l-amino-3-hydroxy-methylcyclobutane-1-carboxylic acid, an achiral non-protein amino acid, Tetrahedron, 43, 1857–1861 (1987).
4. Bell, E. A., “Uncommon” amino acids, FEBS Lett., 64, 29–35 (1976).
5. Bell, E. A., Non-protein amino acids in the Leguminosae, in Advances in Legume Systematics, Vol. 2 (R. M. Polhill and P. H. Raven, eds.) 489–499, Royal Botanical Gardens Kew, UK, 1981.