@article {MR1832319,
	title = {Abelian kernels of some monoids of injective partial transformations and an application},
	journal = {Semigroup Forum},
	volume = {61},
	number = {3},
	year = {2000},
	pages = {435{\textendash}452},
	issn = {0037-1912},
	doi = {10.1007/s002330000033},
	url = {http://dx.doi.org/10.1007/s002330000033},
	author = {Delgado, Manuel and Fernandes, V{\'\i}tor H.}
}
