Klopčič, Marija, J. Pogačar, és Oto Hanuš. „Comparison of Urea Content in Milk, Measured in Different Laboratories”. Acta Agraria Kaposváriensis 3, no. 2 (július 15, 1999): 71–77. Elérés december 5, 2025. https://journal.uni-mate.hu/index.php/aak/article/view/1350.