Broström, Peter, and Kaj Holmberg. “Compatible Weights and Valid Cycles in Non-Spanning OSPF Routing Patterns”. Algorithmic Operations Research 4, no. 1 (February 3, 2009): Pages 19 – 35. Accessed April 23, 2024. https://journals.lib.unb.ca/index.php/AOR/article/view/4175.