\begin{thebibliography}{1}

\bibitem{arendas}
P.~{\'A}rend{\'a}s et~al., Compositions of complements of graphs, {\em
  Integers} {\bf 16}(29) (2016), A29.

\bibitem{bajguz}
W.~Bajguz, Graph and union of graphs compositions, preprint, 2006.
\newblock Available at \url{https://arxiv.org/abs/math/0601755}.

\bibitem{huq}
A.~Huq, Compositions of graphs revisited, {\em Electron. J. Combin.} {\bf 14}
  (2007), 15.

\bibitem{knopfmacher+mays}
A.~Knopfmacher and M.~E. Mays, Graph compositions {I}: Basic enumeration, {\em
  Integers} {\bf 1}(4) (2001), A4.

\bibitem{ridley+mays}
J.~N. Ridley and M.~E. Mays, Compositions of unions of graphs, {\em Fibonacci
  Quart.} {\bf 43} (2004), 222--230.

\end{thebibliography}
