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## Links to Software  By combining tools discussed elsewhere in this document, once can "mint" digital object identifiers that point to a particular version of software, assuming it is stored in an organized repostitory. One example is given here: https://guides.github.com/activities/citable-code/, on a web page that shows how to mint a citable DOI for code using the [GitHub](http://github.com) and [Zenodo] (http://zenodo.org) services together. xx AG clean up this info: The ASCL is indexed by the SAO/NASA Astrophysics Data System (ADS) and is citable by using the unique ascl ID assigned to each code. xx