Carmesin, Johannes, and Tsvetomir Mihaylov. “Outerspatial 2-Complexes: Extending the Class of Outerplanar Graphs to Three Dimensions”. The Electronic Journal of Combinatorics 30, no. 3 (August 11, 2023): P3.20. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v30i3p20.