Borri, Alessandro, Tiziana Calamoneri, and Rossella Petreschi. “Recognition of Unigraphs through Superposition of Graphs”. Journal of Graph Algorithms and Applications 15, no. 3 (July 1, 2011): 323–343. Accessed June 30, 2024. https://jgaa.info/index.php/jgaa/article/view/paper229.