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\subsection{\label{sec:multiple}Multiple references in a single bibliography entry}  One of the most frequently requested features since the release of \revtex~4 has been to allow more than one reference to appear in a single bibliography entry when using Bib\TeX. This can now be done in \revtex~4.1 by using a starred (*) argument to the \cmd\cite\ command. This requires the latest version of \texttt{natbib}, developed in conjunction with \revtex~4.1, and the new \texttt{bst} files that come with \revtex~4.1. To combine multiple references into a single \cmd\bibitem, precede the second, third, etc. citation keys in the \cmd\cite\ command with an asterisk (*). For example \verb+\cite{bethe, *feynman, *bohr}+ \verb+\cite{bethe,*feynman,*bohr}+  will combine the \cmd\bibitem\relax s with keys \texttt{bethe}, \texttt{feynman}, and \texttt{bohr} into a single entry in the bibliography separated by semicolons. \subsection{\label{sec:prepend}Prepending and/or appending text to a citation}  The expanded syntax for the \cmd\cite\ command argument can also be used to specify text before and/or after a citation. For instance, a citation such as: