Expanders, exact crossed products, and the Baum–Connes conjecture. Baum, P., Guentner, E., & Willett, R. Annals of K-theory, 1(2):155–208, 2015.
bibtex   
@article{baum_expanders_2015,
	title = {Expanders, exact crossed products, and the {Baum}–{Connes} conjecture},
	volume = {1},
	number = {2},
	journal = {Annals of K-theory},
	author = {Baum, Paul and Guentner, Erik and Willett, Rufus},
	year = {2015},
	pages = {155--208},
}

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