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\begin{center}  \begin{tabular}{llll}  Feature & Web & Print & Example \\ \hline  Citations & ✓ & ✓ & \cite{KohDavGin:psewads11} \\ \hline  Math & ✓ & ✓ & $P(E) = {n \choose k} p^k (1-p)^{ n-k}$ \\  Labels/Refs & ✓ & ✓ & See Fig. \ref{fig:xkcd} \\  Metadata & ✓ & ✓ & Author, Title, License, ... \\