Žgajnar, Jaka, Emil Erjavec, and Stane Kavčič. “Multi-Step Beef Ration Optimisation: Application of Linear and Weighted Goal Programming With a Penalty Function”. Agricultural and Food Science 19, no. 3 (January 3, 2010): 193–206. Accessed November 22, 2024. https://journal.fi/afs/article/view/5986.