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# Deeper, Easier, Citations  Many scientists already use some kind of reference managment system, whether it is a giant .bbl library alongside their local TeX installation, an ADS Private Libraray, or more sophisticated generalized solutions like EndNote, Papers, Mendeley, Zotero, etc.  Inserting a reference in a tool like Authorea 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}