\begin{thebibliography}{18}
\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi
\providecommand{\enquote}[1]{``#1''}
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{\texttt{#1}}\fi
\expandafter\ifx\csname urlprefix\endcsname\relax\def\urlprefix{URL }\fi
\providecommand{\eprint}[2][]{\url{#2}}

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P.~{Riley}, R.~{Lionello}, J.~A. {Linker}, Z.~{Mikic}, J.~{Luhmann}, and
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P.~{Riley}, R.~{Lionello}, J.~A. {Linker}, Z.~{Mikic}, J.~{Luhmann}, and
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\bibitem[{Riley} et~al.(2010{\natexlab{b}})]{riley10d}
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R.~Lionello, J.~A. Linker, and Z.~Miki\'c, \emph{Astrophys. J.} \textbf{546},
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S.~K. Antiochos, Z.~Miki{\'c}, V.~S. Titov, R.~Lionello, and J.~A. Linker,
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\bibitem[{Riley} and {Luhmann}(2011)]{riley11e}
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\end{thebibliography}
