Kosztyan, Zsolt Tibor, Zoltan Perjes, and Andrea Bencsik. “Cost Reduction by Means of Alternative Solutions”. Communications - Scientific letters of the University of Zilina 8, no. 3 (September 30, 2006): 12-16. Accessed April 6, 2026. http://journals.uniza.sk/index.php/communications/article/view/1198.