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