Cvetković, Dragoš M., and Mirjana M. Čangalović. “Finding Minimal Branchings With a Given Number of Arcs”. Yugoslav Journal of Operations Research 12, no. 1 (March 1, 2002): 1–10. Accessed November 18, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/62.