LaTeX only prints first citation

If you’re using a citation style from the harvard package in LaTeX, you might be surprised to find that

\cite{Kremer2012, Campbell1999}

only works on the first citation

(Kremer et al. 2012, ?) .

Unlike some citation styles/packages (notably the default ‘plain’), the harvard package doesn’t allow spaces between citations. To fix this problem just change the example above to

\cite{Kremer2012,Campbell1999}

and your problem is solved!

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