# Q66630395
**Wikidata**: [Q66630395](https://www.wikidata.org/wiki/Q66630395)  
**Source**: https://4ort.xyz/entity/q66630395


## References

1. SIMBAD
2. VizieR Online Data Catalog: Henry Draper Catalogue and Extension, published in Ann. Harvard Obs. 91-100 (1918-1925)
3. Observational studies of cepheid amplitudes. I. Period-amplitude relationships for galactic cepheids and interrelation of amplitudes
4. Catalogue of Stellar Photometry in Johnson's 11-color system
5. Period-colour and amplitude-colour relations in classical Cepheid variables - IV. The multiphase relations
6. Gaia Data Release 2
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. The distribution of the elements in the galactic disk. III. A reconsideration of Cepheids from l = 30{deg} to 250{deg}
9. Barium abundances in Cepheids