Geodesic
The second bounded cohomology group
Zapiski Nauchnykh Seminarov POMI, Investigations in topology. Part 6, Tome 167 (1988), pp. 117-120

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The goal of the paper is to prove that the canonical seminorm on the second bounded cohomology group is always a norm. The corresponding question remains open in the higher dimensional cases. 
@article{ZNSL_1988_167_a7,
     author = {N. V. Ivanov},
     title = {The second bounded cohomology group},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {117--120},
     publisher = {mathdoc},
     volume = {167},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1988_167_a7/}
}
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N. V. Ivanov. The second bounded cohomology group. Zapiski Nauchnykh Seminarov POMI, Investigations in topology. Part 6, Tome 167 (1988), pp. 117-120. http://geodesic.mathdoc.fr/item/ZNSL_1988_167_a7/