TONEV , Tony K. Risk of cultivation and effect of mineral fertilization on winter oilseed rape under the conditions of north-east Bulgaria. Plant Breeding and Seed Science, [S. l.], v. 53, p. 97–107, 2006. Disponível em: http://ojs.ihar.edu.pl/index.php/pbss/article/view/663. Acesso em: 11 jan. 2025.