@article{10_37236_2455,
     author = {Wilfried Huss and Ecaterina Sava},
     title = {The rotor-router group of directed covers of graphs},
     journal = {The electronic journal of combinatorics},
     year = {2012},
     volume = {19},
     number = {3},
     doi = {10.37236/2455},
     zbl = {1252.05209},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2455/}
}