> For the complete documentation index, see [llms.txt](https://coartraining.gitbook.io/coar-repository-toolkit/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://coartraining.gitbook.io/coar-repository-toolkit/interoperability/additional-resources.md).

# Additional resources

* [DOI Handbook](http://www.doi.org/hb.html)
* [What is a DOI, Handle, ARK, URL, URI, ...?](https://project-thor.readme.io/docs/project-glossary)
* [ANDS Guide Digital Object Identifier (DOI) system for research data](<http://www.ands.org.au/guides/doi >)&#x20;