1. Amuti, K.S. and Pollard, C.J. 1977. Phytochemistry 16: 529–532.
2. Barton, L.V. 1961. Seed Preservation and Longevity. New York: Interscience Publishers.
3. Bewley, J.D. and Black, M. 1994. Seeds, Physiology of Development and Germination. Second Edition, pp. 445. New York and London: Plenum Press.
4. Buitink, J., Vertucci, C.W., Hoekstra, F.A. and Leprince, O. 1996. Plant Physiology (in press).
5. Carpenter, J.F., Arakawa, T. and Crowe, J.H. 1992. Developmental Biology Standard 74: 225–240.