PG 1553+113

[References]

H.E.S.S.: F. Aharonian et al. Astron. Astrophys. 448, L19-L23 (2006)
            F. Aharonian et al. Astron. Astrophys. 477, 481-489 (2008)
            W. Benbow et al., 30th ICRC (2007) / arXiv:0710.4057 [astro-ph] p.126

MAGIC: J. Albert et al., Astrophys. J. Lett. 654, L119-L122 (2007)
           J. Albert et al., Astrophys. J. 684, 1351 (2009)
           J. Aleksic et al., Astron. Astrophys. 515, A76 (2010)
           J. Aleksic et al., arXiv:1101.2764 [astro-ph]

MAGIC/AGILE: N. Mankuzhiyil et a;. 31st ICRC (2009) / arXiv:0907.0740 [astro-ph]

VERITAS: M. Orr et al., ICRC 2011 / arXiv:1110.4643 [astro-ph]