@article{01716036, title = {A norm for the cohomology of 2-complexes.}, journal = {Geometry \& Topology}, volume = {6}, year = {2002}, pages = {137-155}, doi = {10.2140/agt.2002.2.137}, zbl = {1014.57002}, language = {en}, url = {http://dml.mathdoc.fr/item/01716036} }
Turaev, Vladimir. A norm for the cohomology of 2-complexes.. Geometry & Topology, Tome 6 (2002) pp. 137-155. doi : 10.2140/agt.2002.2.137. http://gdmltest.u-ga.fr/item/01716036/