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| bl lacertae objects : individual (1es 1959+650) (1) |
| calibration (1) |
| cherenkov telescopes (1) |
| gamma rays : observations (1) |
| h1426+428 (1) |
| markarian-421 (1) |
| project (1) |
| radiation (1) |
| strong flares (1) |
| system (1) |