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- astrophysics - cosmology and nongalactic astrophysics155
- astrophysics - astrophysics of galaxies99
- gravitational lensing: strong96
- astrophysics92
- fos: physical sciences65
- astrophysics - instrumentation and methods for astrophysics61
- gravitational lenses60
- astrophysics::cosmology and extragalactic astrophysics58
- quasars51