1. Ahloowalia BS (1976) Chromosomal changes in parasexually produced rye grass. In: Jones K, Brandham PE (eds) Current chromosome research. Elsevier, Amsterdam, pp 115?122
2. Bayliss, MW (1980) Chromosomal variation in plant tissues in culture. In: Vasil IK (ed) Perspectives in plant cell and tissue culture. Academic Press, London New York, pp 113?144
3. Cheng TY, Smith HH (1975) Organogenesis from callus culture of Hordeum vulgare. Planta 123:307?310
4. Crane CF (1978) Apomixis and Crossing Incompatibilities in some Zephyranthaceae. PhD Thesis. University of Texas, Austin, Texas
5. Edallo S, Zucchinali C, Perenzin M, Salamini F (1981) Chromosomal variation and frequency of spontaneous mutation associated with in vitro culture and plant regeneration in maize. Maydica 26:39?56