1. Merkle, S.A., Parrott, W.A., Williams, E.G., Applications of somatic embryogenesis and embryo cloning, in Plant Tissue Culture: Applications and Limitations, Bhojwani, S.S., Ed., Elsevier, Amsterdam, 1990, 67.
2. Racusen, R.H., and Schiavone, F.M., Positional cues and differential gene expression in somatic embryos of higher plants, Cell Diff. Develop., 30, 159, 1990.
3. Dudits, D., Bogre, L., and Gyorgyey, J., Molecular and cellular approaches to the analysis of plant embryo development from somatic cells in vitro, J. Cell Sei., 99, 475, 1991.
4. Jacobsen, H.-J., Somatic embryogenesis in seed legumes: the possible role of soluble auxin receptors, Ureal J. Bot., 40, 139, 1991.
5. Ammirato, P.V., Patterns of development in culture, in Tissue Culture in Forestry and Agriculture, Henke, R.R., Hughes, K.W., and Constantin, M.J., Eds., Plenum Press, New York, 1985, 9.