@inbook {MR3203983,
	title = {Some operator algebras from semigroups},
	booktitle = {Algebraic methods in functional analysis},
	series = {Oper. Theory Adv. Appl.},
	volume = {233},
	year = {2014},
	pages = {75{\textendash}84},
	publisher = {Birkh{\"a}user/Springer, Basel},
	organization = {Birkh{\"a}user/Springer, Basel},
	url = {https://doi.org/10.1007/978-3-0348-0502-5_5},
	author = {Katavolos, A.}
}
