Riley TR, Thurston WP. The Absence of Efficient Dual Pairs of Spanning Trees in Planar Graphs. Electron. J. Combin. [Internet]. 2006Aug.25 [cited 2026Apr.12];13(1):#N13. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v13i1n13