@article{10_2140_agt_2007_7_755,
     author = {Harvey, Shelly L and Friedl, Stefan},
     title = {Non-commutative multivariable {Reidemester} torsion and the {Thurston} norm},
     journal = {Algebraic and Geometric Topology},
     pages = {755--777},
     year = {2007},
     volume = {7},
     number = {2},
     doi = {10.2140/agt.2007.7.755},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2007.7.755/}
}