@book{6754,
	author = {Ljapin, E. S.},
	title = {Semigroups /},
	publisher = {American Mathematical Society,},
	year = {1963.},
	series = {Translations of mathematical monographs ;},
	address = {Providence :},
	note = {"Publication aided by grant NSF-GN 57 from the National Science Foundation."}
}