The electronic world atlas of varieties of English (eWAVE). Kortmann, B. & Lunkenheimer, K., editors Max Planck Institute for Evolutionary Anthropology, Leipzig, 2013.
The electronic world atlas of varieties of English (eWAVE) [link]Paper  bibtex   1 download  
@book{kortmann_electronic_2013,
	address = {Leipzig},
	title = {The electronic world atlas of varieties of {English} ({eWAVE})},
	url = {http://ewave-atlas.org/},
	urldate = {2016-09-29},
	publisher = {Max Planck Institute for Evolutionary Anthropology},
	editor = {Kortmann, Bernd and Lunkenheimer, Kerstin},
	year = {2013},
	keywords = {Null copula},
}

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