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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 into the "/\cite" command argument. "cite" command, as shown below.  Cut and pasting DOI links also work in Authorea, as well as in other tools.