Bounded cohomology characterizes hyperbolic groups. Mineyev, I. The Quarterly Journal of Mathematics, 53(1):59–73, 2002.
bibtex   
@article{mineyev_bounded_2002,
	title = {Bounded cohomology characterizes hyperbolic groups},
	volume = {53},
	number = {1},
	journal = {The Quarterly Journal of Mathematics},
	author = {Mineyev, Igor},
	year = {2002},
	pages = {59--73},
}

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