1. DeDeo, M., Martinez, M., Medrano, A., Minei, M., Stark, H., and Terras, A. (2004). Spectra of Heisenberg graphs over finite rings. In Feng, W., Hu, S., and Lin, X., editors, Discrete and Continuous Dynamical Systems, 2003 Supplement Volume, pages 213–222. Proc. of 4th Internatl. Conf. on Dynamical Systems and Differential Equations.
2. Diaconis, P. and Saloff-Coste, L. (1994). Moderate growth and random walk on finite groups. Geom. Funct. Anal., 4:1–36.
3. Godsil, C. D. (1993). Algebraic Combinatorics. Chapman and Hall, New York.
4. Hashimoto, K. (1990). On Zeta and L-functions of finite graphs. Intl. J. Math., 1(4):381–396.
5. Hofstadter, D. R. (1976). Energy levels and wave functions of Bloch electrons in rational and irrational magnetic fields. Physical Review B, 14:2239–2249.