Characteristic polynomials of some graph coverings

L-functions for images of graph coverings by some operations

Discrete Mathematics

Decomposition formulas of zeta functions of graphs and digraphs

Discrete Mathematics

Weighted zeta functions of graphs

Journal of Combinatorial Theory Series B

Characteristic polynomials of ramified uniform covering digraphs

European Journal of Combinatorics

Laplacian spectra of regular graph transformations

Discrete Applied Mathematics