@article{spielberg_free-product_1991,
	title = {Free-product groups, {Cuntz}-{Krieger} algebras, and covariant maps},
	volume = {2},
	url = {http://www.worldscientific.com/doi/abs/10.1142/S0129167X91000260},
	number = {04},
	urldate = {2017-07-11},
	journal = {International Journal of Mathematics},
	author = {Spielberg, John},
	year = {1991},
	pages = {457--476},
}

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