Omori, Toshiaki, Hisashi Naito, and Tatsuya Tate. 2019. “Eigenvalues of the Laplacian on the Goldberg-Coxeter Constructions for 3- and 4-Valent Graphs”. The Electronic Journal of Combinatorics 26 (3), P3.7. https://doi.org/10.37236/8481.