@article {MR2888438,
	title = {Operator algebras from the discrete {H}eisenberg semigroup},
	journal = {Proc. Edinb. Math. Soc. (2)},
	volume = {55},
	number = {1},
	year = {2012},
	pages = {1{\textendash}22},
	issn = {0013-0915},
	url = {https://doi.org/10.1017/S0013091510000143},
	author = {Anoussis, M. and Katavolos, A. and Todorov, I. G.}
}
