@article{01872691,
title = {On 4-fold covering moves.},
journal = {Geometry \& Topology},
volume = {7},
year = {2003},
pages = {117-145},
doi = {10.2140/agt.2003.3.117},
zbl = {1014.57001},
language = {en},
url = {http://dml.mathdoc.fr/item/01872691}
}
Apostolakis, Nikos. On 4-fold covering moves.. Geometry & Topology, Tome 7 (2003) pp. 117-145. doi : 10.2140/agt.2003.3.117. http://gdmltest.u-ga.fr/item/01872691/