To be or double be? Current changes in the English copula. McConvell, P. Australian Journal of Linguistics, 8(2):287–305, December, 1988.
To be or double be? Current changes in the English copula [link]Paper  doi  bibtex   
@article{mcconvell_be_1988,
	title = {To be or double be? {Current} changes in the {English} copula},
	volume = {8},
	issn = {0726-8602},
	shorttitle = {To be or double be?},
	url = {http://www.tandfonline.com/doi/abs/10.1080/07268608808599401},
	doi = {10.1080/07268608808599401},
	number = {2},
	journal = {Australian Journal of Linguistics},
	author = {McConvell, Patrick},
	month = dec,
	year = {1988},
	keywords = {Double is},
	pages = {287--305},
}

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