Erdős, Péter L., István Miklós, and Zoltán Toroczkai. “A Simple Havel-Hakimi Type Algorithm to Realize Graphical Degree Sequences of Directed Graphs”. The Electronic Journal of Combinatorics 17, no. 1 (April 30, 2010): R66. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1r66.