- BurIan, GW. (1952). In: Froc. f5!h Int!. Grassland Cong., I: 277-83.
- Dewey, DR and Lu, K.H. (1959). Agron. J., 51: 515-18.
- Kaul, J.N. et a/. (1976). J. Agric. Sci., 86: 219.
- Kumari, P. and Verma, S.K. (1983). Indian J. Plant Physiol., 26: 402-5.
- Ojega Ojehomon, 0.0. (1972). J. Exp. Bot., 23: 751-61.