Amenable semigroups. Day, M. M. Illinois Journal of Mathematics, 1(4):509–544, 1957.
Amenable semigroups [link]Paper  bibtex   
@article{day_amenable_1957,
	title = {Amenable semigroups},
	volume = {1},
	url = {http://projecteuclid.org/euclid.ijm/1255380675},
	number = {4},
	urldate = {2017-08-18},
	journal = {Illinois Journal of Mathematics},
	author = {Day, Mahlon M.},
	year = {1957},
	pages = {509--544},
}

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