A. Marinov-Serafimov, Plamen, Irena A. Golubinova, and Aneliya I. Katova. 2021. “Reaction of Bulgarian Varieties of Perennial Ryegrass (Lolium Perenne L.) to Glyphosate”. Bulgarian Journal of Agricultural Science 27 (5): 911-18. https://agriacad.eu/ojs/index.php/bjas/article/view/2129.