@Article{Foryś2008,
author = "Foryś, Wit",
title = "On a complete lattice of retracts of a free monoid generated by three elements",
journal = "Opuscula Math.",
year = "2008",
volume = "28",
number = "2",
pages = "123--127",
doi = "http://dx.doi.org/10.7494/OpMath.2008.28.2.123",
url = "http://dx.doi.org/10.7494/OpMath.2008.28.2.123",
abstract = "We prove that the family of retracts of a free monoid generated by three elements, partially ordered with respect to the inclusion, is a complete lattice.",
keywords = "free monoid, retract, lattice, complete lattice",
issn = "1232-9274"
}