1. Ammirato, P.V. and F. C. Steward, 1971. Some effects of environment on the development embryos from cultured free cells. Bot Gaz 132: 149–158
2. Bayliss, M. W., 1980. Chromosomal variation in plant tissues in culture. Int Rev Cytol supplement 11A: 113–144
3. Buchheim, J. A., S. M. Colburm and J. P. Ranch, 1989. Maturation of soybean somatic embryos and the transition to plantlet growth. Plant Physiol 89: 765–775
4. Cazzulio, D., H. Pedersen, C.-K. Chin, K. Venkat and C. Styer, 1987. Characterization of plant somatic embryo development using Fourier shape analysis. Ann. New York Acad. Sci. 506: 190–195
5. Cazzulio, D., H. Pedersen and C.-K. Chin, 1990. Monitoring somatic embryo development in carrot cell cultures. Dev Ind Microbiol 31: 285–292