Venugopalan, M V, Rachana Deshmukh, K B Hebbar, and N R Tandulkar. 2012. “Productivity and Nitrogen-Use Efficiency Yardsticks in Conventional and Bt Cotton Hybrids on Rainfed Vertisols”. The Indian Journal of Agricultural Sciences 82 (7): 641–4. https://doi.org/10.56093/ijas.v82i7.21694.