So eh? is Canadian, eh?. Avis, W. S. Canadian Journal of Linguistics/Revue canadienne de linguistique, 17(2-3):89–104, 1972.
So eh? is Canadian, eh? [link]Paper  doi  bibtex   
@article{avis_so_1972,
	title = {So eh? is {Canadian}, eh?},
	volume = {17},
	issn = {0008-4131, 1710-1115},
	shorttitle = {So eh?},
	url = {https://www.cambridge.org/core/product/identifier/S0008413100007039/type/journal_article},
	doi = {10.1017/S0008413100007039},
	language = {en},
	number = {2-3},
	urldate = {2018-09-01},
	journal = {Canadian Journal of Linguistics/Revue canadienne de linguistique},
	author = {Avis, Walter S.},
	year = {1972},
	keywords = {Canadian eh},
	pages = {89--104},
}

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