# IC 4639
**Wikidata**: [Q3681912](https://www.wikidata.org/wiki/Q3681912)  
**Source**: https://4ort.xyz/entity/q3681912


## References

1. SIMBAD
2. Box/peanut and bar structures in edge-on and face-on nearby galaxies in the Sloan Digital Sky Survey - I. Catalogue
3. The ninth data release of the Sloan Digital Sky Survey: first spectroscopic data from the SDSS-III baryon oscillation spectroscopic survey
4. Gaia Data Release 2
5. The Two Micron All Sky Survey (2MASS)
6. Galaxy groups: a 2MASS catalog