Wiewióra, Barbara. “The Effect of Seed Health of Perennial Ryegrass (Lolium Perenne L.) on Germination Capacity”. Plant Breeding and Seed Science 65 (April 19, 2012): 51–62. Accessed May 3, 2024. http://ojs.ihar.edu.pl/index.php/pbss/article/view/331.