Dyulgerski, Yovko, Yonko Yonchev, and Marina Drumeva-Yoncheva. 2015. “Dissemination of Tobacco Mosaic Virus (TMV) in Virginia and Burley Tobacco”. Bulgarian Journal of Crop Science 52 (5): 52-55. https://agriacad.eu/ojs/index.php/bjcs/article/view/3433.