%0 Journal Article %T Idempotent Elements of the Endomorphism Semiring of a Finite Chain %A Ivan Trendafilov %A Dimitrinka Vladeva %J ISRN Algebra %D 2013 %I Hindawi Publishing Corporation %R 10.1155/2013/120231 %U http://dx.doi.org/10.1155/2013/120231