@article{10_2140_agt_2002_2_137,
     author = {Turaev, Vladimir},
     title = {A norm for the cohomology of 2{\textendash}complexes},
     journal = {Algebraic and Geometric Topology},
     pages = {137--155},
     year = {2002},
     volume = {2},
     number = {1},
     doi = {10.2140/agt.2002.2.137},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2002.2.137/}
}