Bouey, Colleen, Christina Graves, Aaron Ostrander, and Gregory Palma. “Non-Recursively Constructible Recursive Families of Graphs”. The Electronic Journal of Combinatorics 19, no. 2 (April 16, 2012): P9. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v19i2p9.