Ali, Patrick, Dankelmann, Peter, Morgan, Megan J., Mukwembi, Simon, Swart, Henda, and Vetrík, Tomás. “The Average Eccentricity, Spanning Trees of Plane Graphs, Size and Order”. Utilitas Mathematica 107 (June 9, 2018). Accessed July 29, 2026. https://utilitasmathematica.com/index.php/Index/article/view/1322.