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| active galactic nuclei (1) |
| bl lacertae objects: individual: mrk 421 (1) |
| blazars (1) |
| emission (1) |
| light curves (1) |
| markarian-421 (1) |
| optical variability (1) |
| power spectra (1) |
| telescope (1) |
| tev photons (1) |