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Inserting citations using any of these tools is relatively easy in nearly any of the online authoring systems discussed above (e.g. Authorea, shareLaTeX, writeLaTeX).   If an astronomer uses Authorea, inserting a reference is as simple as cutting & pasting the URL from ADS, like this: \cite{2014arXiv1401.2134G}. \cite{Goodman_2014} Cut and pasting DOI links also work in Authorea, as well as in other tools. (For example \cite{Goodman_2014}.)