[1] S. E. Anderson, Y. Guo, A. Tenney, K. A. Wash, Prime factorization and domination in the hierar-
chical product of graphs, Discuss. Math. Graph Theory 37 (2017) 873–890, doi:10.7151/dmgt.1952.
[2] L. Barrière, F. Comellas, C. Dalfó, and M. A. Fiol, On the hierarchical product of
graphs and the generalized binomial tree, Linear Multilinear Algebra 57 (2009) 695–712,
doi:10.1080/03081080802305381.
[3] L. Barriére, F. Comellas, C. Dalfó, M. A. Fiol, The hierarchical product of graphs, Discrete Appl.
Math. 157 (2009) 36–48, doi:10.1016/j.dam.2008.04.018.
[4] L. Barriére, C. Dalfó, M. A. Fiol, M. Mitjana, The generalized hierarchical product of graphs, Dis-
crete Math. 309 (2009) 3871–3881, doi:10.1016/j.disc.2008.10.028.
[5] C. D. Godsil, B. D. McKay, A new graph product and its spectrum, Bull. Aust. Math. Soc. 18 (1978)
21–28, doi:10.1017/S0004972700007760.
[6] W. Imrich, R. Kalinowski, M. Pil´ sniak, Hierarchical product graphs and their prime factorization,
Art Discrete Appl. Math. accepted for publication 2024.