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- galaxies: seyfert40
- astrophysics - astrophysics of galaxies39
- astrophysics34
- astrophysics - high energy astrophysical phenomena34
- astrophysics::high energy astrophysical phenomena34
- astrophysics::cosmology and extragalactic astrophysics33
- astrophysics::galaxy astrophysics33
- galaxies: active33
- fos: physical sciences27