@online{AndyThomas:Analog,
  author={Thomas, Andy},
  title={Analog of {\texttt{\csname textbackslash\endcsname}pdfelapsedtime} for
      {\hologo{LuaTeX}} and {\hologo{XeTeX}}},
  url={http://tex.stackexchange.com/a/32531},
  urldate={2011-11-29},
}