Yanev, M., Bozukov, H., & Kalinova, S. (2014). Distribution of Orobanche ramosa L. and Orobanche mutelii Sch. in the Main Tobacco Producing Regions of Bulgaria. Bulgarian Journal of Crop Science, 51(1), 114-117. https://agriacad.eu/ojs/index.php/bjcs/article/view/3577