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- BL Lacertae objects: individual: 3C 279 2
- Bl Lacertae Objects: Individual: AO 0235+16 1
- Bl Lacertae Objects: Individual: Ao 0235+16 1
- BL Lacertae objects: individual: BL Lacertae 1
- BL Lacertae objects: individual: Mkn 421 1
- BL Lacertae objects: individual: Mrk 421 2
- BL Lacertae objects: individual: OJ 287 1
- BL Lacertae objects: individual: PG 1553+113 1
- BL Lacertae Objects: Individual: PKS 0735+178 1
- BL Lacertae objects: individual: RGB J0710 1
- BL Lacertae Objects: Individual: S5 0716+714 1
- BL Lacertae objects: individual: S5 0716+714 1
- BL Lacertae objects:general 1
- Black Body Radiation 5
- Black body radiation 1
- Black carbon 1
- Black Hole 3
- Black hole 5
- Black Hole (Solitonic) 1
- Black hole binaries 2