K. PRABHAKAR and A. VARMA, M. R. A. B. R. J. R. P. Y. A. (2002). Partial characterization of an isometric virus causing sunflower necrosis disease. Indian Phytopathology, 54(2), 246-250. https://epubs.icar.org.in/index.php/IPPJ/article/view/18937