1. Bayliss, M. W. (1977). Protoplasma 92:109?115.
2. Bayliss, M. W. (1980). In: Vasil, I. K. (Ed). International Review of Cytology, Vol. 11A, Academic Press, New York, pp. 113?144.
3. Burk, L. G. (1970). J. Hered. 61:279.
4. Burns, J. A.; Gerstel, D. U. (1973). Genetics 75:497?502.
5. D'Amato, F. (1978). In: Thorpe, T. A. (Ed). Frontiers of Plant Tissue Culture 1978, Univ. of Calgary Press, pp. 287?295.