\[ **up: [[Research]]** ] --- # DOI A digital object identifier (DOI) is a persistent identifier or handle used to uniquely identify various objects, standardized by the International Organization for Standardization (ISO).[^1] --- ## ↬ External resources - [Crossref — Metadata search](https://search.crossref.org/) - [Crossref — Simple text query](https://doi.crossref.org/simpleTextQuery) [^1]: ‘Digital object identifier’, Wikipedia, last edited 7 September 2025, 09:54 (UTC), https://en.wikipedia.org/wiki/Digital_object_identifier.