@article {MR2395204,
	title = {The idempotent-separating degree of a block-group},
	journal = {Semigroup Forum},
	volume = {76},
	number = {3},
	year = {2008},
	pages = {579{\textendash}583},
	issn = {0037-1912},
	doi = {10.1007/s00233-008-9043-y},
	url = {http://dx.doi.org/10.1007/s00233-008-9043-y},
	author = {Fernandes, V{\'\i}tor H.}
}
