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# Deeper, Easier Citations  Many scientists already use some kind of reference management 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. \cite{Kurtz_2010}  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).