@article{02206545,
title = {End reductions, fundamental groups, and covering spaces of irreducible open 3-manifolds.},
journal = {Geometry \& Topology},
volume = {5},
year = {2005},
pages = {971-990},
doi = {10.2140/gt.2005.9.971},
zbl = {1092.57002},
language = {en},
url = {http://dml.mathdoc.fr/item/02206545}
}
Myers, Robert. End reductions, fundamental groups, and covering spaces of irreducible open 3-manifolds.. Geometry & Topology, Tome 5 (2005) pp. 971-990. doi : 10.2140/gt.2005.9.971. http://gdmltest.u-ga.fr/item/02206545/