@article{heinz_inner_1990,
	title = {Inner {Circles} or {Hollow} {Cores}},
	volume = {52},
	number = {2*},
	journal = {Journal of Politics},
	author = {Heinz, J. P. and Laumann, E. O. and Salisbury, R. H. and Nelson, R. L.},
	year = {1990},
	pages = {356--390},
	file = {2131898.pdf:files/47617/2131898.pdf:application/pdf}
}

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