# Einstein Cross

> image of a quasar

**Wikidata**: [Q922419](https://www.wikidata.org/wiki/Q922419)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Einstein_Cross)  
**Source**: https://4ort.xyz/entity/einstein-cross


## References

1. SIMBAD
2. VizieR
3. Freebase Data Dumps. 2013
4. A Study of Quasar Absorption-Line Systems With IRAS
5. The first addition to the new optical catalog of quasi-stellar objects
6. The Two Micron All Sky Survey (2MASS)
7. A catalogue of absorption-line systems in QSO spectra