@article {MR2360515,
	title = {Largest 2-generated subsemigroups of the symmetric inverse semigroup},
	journal = {Proc. Edinb. Math. Soc. (2)},
	volume = {50},
	number = {3},
	year = {2007},
	pages = {551{\textendash}561},
	issn = {0013-0915},
	doi = {10.1017/S0013091505001598},
	url = {http://dx.doi.org/10.1017/S0013091505001598},
	author = {Andr{\'e}, J. M. and Fernandes, V. H. and Mitchell, J. D.}
}
