Boczar, Paweł, and Lucyna Błażejczyk-Majka. 2011. “COMPETITION FOR SPACE BETWEEN CEREALS AND OIL CROPS IN TERMS OF ITS WORLDWIDE DYNAMICS”. Acta Scientiarum Polonorum. Oeconomia 10 (2), 5-17. https://js.wne.sggw.pl/index.php/aspe/article/view/4006.