# Masahiko Oka
**Wikidata**: [Q24283690](https://www.wikidata.org/wiki/Q24283690)  
**Source**: https://4ort.xyz/entity/masahiko-oka


## References

1. IdRef
2. Catalog of the German National Library
3. CiNii Research
4. Virtual International Authority File
5. Library of Congress Authorities