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github example--code for d3po?  ## Links to Shared Tools 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 and Zenodo services together.  how to reference sofware & versions (using github doi once they exist?!)