Eubanks-Turner, Christina, and Aihua Li. “Graphical Properties of the Bipartite Graph of $\operatorname{Spec}(\mathbb{Z}[x]) \setminus \{0\}$”. Journal of Algebra Combinatorics Discrete Structures and Applications, vol. 2, no. 1, Jan. 2015, pp. 65-73, doi:10.13069/jacodesmath.66836.