Shlomo Hoory. A lower bound on the spectral radius of the universal cover of a graph. Journal of Combinatorial Theory, Series A, 93(1):33-43, 2005. [doi]
@article{Hoory05,
title = {A lower bound on the spectral radius of the universal cover of a graph},
author = {Shlomo Hoory},
year = {2005},
doi = {10.1016/j.jctb.2004.06.001},
url = {http://dx.doi.org/10.1016/j.jctb.2004.06.001},
tags = {graph-rewriting, rewriting},
researchr = {https://researchr.org/publication/Hoory05},
cites = {0},
citedby = {0},
journal = {Journal of Combinatorial Theory, Series A},
volume = {93},
number = {1},
pages = {33-43},
}