Lakshmanan S., Aparna, Csilla Bujtás, and Zsolt Tuza. “Generalized Line Graphs: Cartesian Products and Complexity of Recognition”. The Electronic Journal of Combinatorics 22, no. 3 (September 11, 2015): P3.33. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v22i3p33.