Annapurna Devi, N., Mohan Kumar, C., Rama Naidu, Y., & Narasimha Rao, M. (2010). Production and Evaluation of Biodiesel from Sunflower (Helianthus annus) and Nigerseed Oil (Guizotia abyssinica). Asian Journal of Chemistry, 18(4), 2951–2958. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/20713