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One of the nice features of porting your code to github is that it is easy to setup a doi. This is also available for datasets in OpenEarth. If you want to have code moved to the openearth github, or if you want to know something about making your data or code citeable, please consult Fedor Baart or Gerben de Boer.
This is an example of the DOI for the Model Message Interface MMI code, which is cited for the IEMSS conference: http://dx.doi.org/10.5281/zenodo.9876