- Information Bulletin on Variable Stars (IBVS) http://www.konkoly.hu/
- General Catalogue of Variable Stars (GCVS) http://www.sai.msu.su/groups/cluster/gcvs/gcvs/
- The SIMBAD astronomical database http://cdsweb.u-strasbg.fr/Simbad.html
- Astrophysics Data System (ADS) http://adswww.harvard.edu/
- Hipparcos Space Astrometry Mission http://astro.estec.esa.nl/Hipparcos/
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