N. CHOPRA, N. K. CHOPRA, S. N. SINHA, and K. CHAND, “Effect of weed stress on seed yield and quality of onion (Allium cepa)*”, Indian J Agri Sci, vol. 80, no. 1, Jan. 2011, Accessed: Oct. 27, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/2817