1. Allard RW (1960) Principles of plant breeding. John Willey & Sons. Inc., New York and London
2. Ito H, Kawaguchi K (1983) Maintenance and seed multiplication of varieties. In: Murakami K (ed) Theory and methods for crop breeding (in Japanese). Yokendo, Tokyo, Japan, pp 248–259
3. Jones MP, Dingkuhn M, Aluko GK et al. (1997) Interspecific Oryza sativa L. × O. glaberrima Steud. progenies in upland rice improvement. Euphytica 92:237–246
4. Poehlman JM (1986) Breeding field crops, 3rd edn. AVI Pub. Co. Inc., Westport, Connecticut, USA
5. Sarla N, Mallikarjuna Swamy BP (2005) Oryza glaberrima: a source for the improvement of Oryza sativa. Current Sci 89:955–963