- Eberhart. SA and Russell. W.A. (1966). Crop Sci.. 6· 36-40.
- Gautam, N.C. and Chaturvedi, AK (1990). Veg. Sci., 17, 175-79
- Gupta. MK eta/. (1998). Crop Research, 16(1): 97·71.
- Joppa. L.R. et a/. (1971). Crop Sci., 11: 238-41.
- Kolra, BS. and Singh. A.K. (1988). (kg. Sci., 15: 155·62.