V. NAIDU and J. G. VARSHNEY, “Interactive effect of elevated COâ‚‚, drought and weed competition on carbon isotope discrimination (Δ¹³ C) in wheat (Triticum aestivum) leaves”, Indian J Agri Sci, vol. 81, no. 11, Nov. 2011, doi: 10.56093/ijas.v81i11.12021.