\begin{thebibliography}{2}
\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{\texttt{#1}}\fi
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\providecommand{\eprint}[2][]{\url{#2}}

\bibitem[{Calonico et~al.(2014{\natexlab{a}})Calonico, Cattaneo and
  Titiunik}]{CCT14}
\textsc{Calonico, S.}, \textsc{Cattaneo, M.~D.} and \textsc{Titiunik, R.}
  (2014{\natexlab{a}}).
\newblock Robust nonparametric confidence intervals for
  regression-discontinuity designs.
\newblock \textit{Econometrica}, \textbf{82} 2295--2326.

\bibitem[{Calonico et~al.(2014{\natexlab{b}})Calonico, Cattaneo and
  Titiunik}]{CCT14supp}
\textsc{Calonico, S.}, \textsc{Cattaneo, M.~D.} and \textsc{Titiunik, R.}
  (2014{\natexlab{b}}).
\newblock Supplement to ``{R}obust nonparametric confidence intervals for
  regression-discontinuity designs".
\newblock \textit{Econometrica Supplement Material}, \textbf{82}.

\end{thebibliography}