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- astrophysics - cosmology and nongalactic astrophysics4
- astrophysics of galaxies (astro-ph.ga)4
- astrophysics::cosmology and extragalactic astrophysics4
- fos: physical sciences4
- 01 natural sciences3
- 0103 physical sciences3
- 010303 astronomy & astrophysics3
- astronomy and astrophysics3
- clusters: general [galaxies]3