Salajpal, Krešimir, Drako Grbeša, Miroslav Kapš, Goran Kiš, and Danijel Karolyi. 2006. “Effect of Added Copper and Full Fat Soybean Meal on Growth Performance and Carcass Properties in Broiler Chickens”. Acta Agraria Kaposváriensis 10 (2): 207-13. https://journal.uni-mate.hu/index.php/aak/article/view/1796.