@article {MR2735668,
	title = {On divisors of semigroups of order-preserving mappings of a finite chain},
	journal = {Semigroup Forum},
	volume = {81},
	number = {3},
	year = {2010},
	pages = {551{\textendash}554},
	issn = {0037-1912},
	doi = {10.1007/s00233-010-9257-7},
	url = {http://dx.doi.org/10.1007/s00233-010-9257-7},
	author = {Fernandes, V{\'\i}tor H. and Volkov, M. V.}
}
