# grey literature

> materials produced by organizations outside of traditional channels

**Wikidata**: [Q1148359](https://www.wikidata.org/wiki/Q1148359)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Grey_literature)  
**Source**: https://4ort.xyz/entity/grey-literature


## References

1. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=7873)
2. [Source](https://lingualibre.org/wiki/Q678328)
3. Nuovo soggettario
4. Freebase Data Dumps. 2013
5. YSO-Wikidata mapping project
6. UMLS 2023
7. National Library of Israel
8. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)
9. Wikibase TDKIV