by Wilfried Huss and Ecaterina Sava
Reference:
Wilfried Huss and Ecaterina Sava, The rotor-router group of directed covers of graphs, Electronic Journal of Combinatorics, 19(3), paper 30, 19 pp., (2012).
Bibtex Entry:
@Article{HussSava2012b,
arxiv = {1206.4267},
author = {Wilfried Huss and Ecaterina Sava},
journal = {Electronic Journal of Combinatorics},
title = {The rotor-router group of directed covers of graphs},
year = {2012},
oatype = {Gold},
number = {3},
pages = {paper 30, 19 pp.},
volume = {19},
groups = {Project01 (Woess), External},
xxmrnumber = {2988852},
url = {http://www.combinatorics.org/ojs/index.php/eljc/article/view/v19i3p30},
}