Walczak, Felicyta, Anna Tratwal, and Maria Golinowska. 2009. “COST-EFFECTIVENESS OF FUNGAL DISEASES CONTROL IN WINTER WHEAT CULTIVATIONS IN POLAND IN 1998-2007”. Journal of Agribusiness and Rural Development 13 (3), 227-34. http://www1.up.poznan.pl/jard/index.php/jard/article/view/896.