SINGH, RAMAN JEET, and I P S AHLAWAT. “Productivity, Competition Indices and Soil Fertility Changes of Bt Cotton (Gossypium Hirsutum) – Groundnut (Arachis Hypogaea) (Gossypium Hirsutum) – Groundnut (Arachis Hypogaea)”. The Indian Journal of Agricultural Sciences, vol. 81, no. 7, July 2011, https://epubs.icar.org.in/index.php/IJAgS/article/view/7376.