@article {22211,
	title = {Durable Effects of Concentrated Disadvantage on Verbal Ability Among African-American Children},
	journal = {Proceedings of the National Academy of Sciences},
	volume = {105},
	year = {2008},
	pages = {845-852},
	author = {Robert J. Sampson and Sharkey, Patrick and Stephen W. Raudenbush}
}
