\newcommand{\etalchar}[1]{$^{#1}$}
\begin{thebibliography}{THA{\etalchar{+}}55}

\bibitem[BEO02]{smallgroups}
H.~U. Besche, B.~Eick, and E.~A. O'Brien.
\newblock {\em {The Small Groups Library - a GAP package}}, 2002.

\bibitem[Dis10]{Dis10}
A.~Distler.
\newblock {\em Classification and Enumeration of finite Semigroups}.
\newblock PhD thesis, St Andrews University, 2010.

\bibitem[Dis14]{Dis14}
Andreas Distler.
\newblock Finite nilpotent semigroups of small coclass.
\newblock {\em Communications in Algebra}, 42(3):1136--1150, 2014.

\bibitem[DMU13]{DMU13}
Andreas Distler, Victor Maltcev, and Abdullahi Umar.
\newblock {J}*={D}* need not hold in finite semigroups.
\newblock {\em submitted}, 2013.
\newblock http://arxiv.org/abs/1302.0985.

\bibitem[For55]{For55}
George~E. Forsythe.
\newblock S{WAC} computes {$126$} distinct semigroups of order {$4$}.
\newblock {\em Proc. Amer. Math. Soc.}, 6:443--447, 1955.

\bibitem[GJM06]{minion}
Ian~P. Gent, Christopher Jefferson, and Ian Miguel.
\newblock Minion: A fast scalable constraint solver.
\newblock In Gerhard Brewka, Silvia Coradeschi, Anna Perini, and Paolo
  Traverso, editors, {\em The European Conference on Artificial Intelligence
  2006 (ECAI 06)}, pages 98--102. IOS Press, 2006.

\bibitem[JW77]{JW77}
H.~J{\"u}rgensen and P.~Wick.
\newblock Die {H}albgruppen der {O}rdnungen {$\leq 7$}.
\newblock {\em Semigroup Forum}, 14(1):69--79, 1977.

\bibitem[Ple67]{Ple67}
Robert~J. Plemmons.
\newblock There are {${\rm 15973}$} semigroups of order {${\rm 6}$}.
\newblock {\em Math. Algorithms}, 2:2--17, 1967.

\bibitem[SYT94]{SZT94}
S.~Satoh, K.~Yama, and M.~Tokizawa.
\newblock Semigroups of order {$8$}.
\newblock {\em Semigroup Forum}, 49(1):7--29, 1994.

\bibitem[Tam54]{tamura2}
Takayuki Tamura.
\newblock Notes on finite semigroups and determination of semigroups of order
  {$4$}.
\newblock {\em J. Gakugei. Tokushima Univ. Math.}, 5:17--27, 1954.

\bibitem[THA{\etalchar{+}}55]{tamura1}
Kazutoshi Tetsuya, Takao Hashimoto, Tadao Akazawa, Ryoichi Shibata, Tadashi
  Inui, and Takayuki Tamura.
\newblock All semigroups of order at most {$5$}.
\newblock {\em J. Gakugei Tokushima Univ. Nat. Sci. Math.}, 6:19--39. Errata on
  loose, unpaginated sheet, 1955.

\end{thebibliography}
