\newcommand{\etalchar}[1]{$^{#1}$} \begin{thebibliography}{DEG{\etalchar{+}}02} \bibitem[DEG{\etalchar{+}}02]{KoutsofiosNorth:2002} D.~Dobkin, J.~Ellson, E.~Gansner, E.~Koutsofios, S.~North, and G.~Woodhull. \newblock Graphviz - graph drawing programs. \newblock Technical report, AT\&T Research and Lucent Bell Labs, 2002. \newblock http://www.graphviz.org/. \end{thebibliography}