Rahman, Muntasir Raihan, Abul Kashem, and MD. Ehtesamul Haque. 2008. “An Efficient On-Line Algorithm for Edge-Ranking of Trees”. INFOCOMP Journal of Computer Science 7 (2):21-25. https://infocomp.dcc.ufla.br/index.php/infocomp/article/view/213.