@unpublished{coppock_origin_2004,
	address = {Evanston, IL: Northwestern University},
	type = {Unpublished manuscript},
	title = {Origin of the {English} double-is construction},
	url = {http://www.casasanto.com/laura/documents/doubleis.pdf},
	urldate = {2017-02-24},
	author = {Coppock, Elizabeth and Staum, Laura},
	year = {2004},
	keywords = {Double is},
}

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