NAUTIYAL, N, C P SHARMA, and C CHATTERJEE. “Role of Copper in Improving the Seed Quality of Sunflower (Helianthus Annuus)”. The Indian Journal of Agricultural Sciences 69, no. 3 (January 16, 2013). Accessed October 28, 2025. https://epubs.icar.org.in/index.php/IJAgS/article/view/26554.