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Acciari V.A, Arlen T., Aune T., Beilicke M., Benbow W., B\'f6ttcher M., Boltuch D., Bradbury S.M, Buckley J.H, Bugaev V. et al..\'a0 2011.\'a0\'a0Spectral Energy Distribution of Markarian 501: Quiescent State Versus Extreme Outburst. The Astrophysical Journal. 729:2.\par \par Aleksi? J., Anderhub H., Antonelli L.A, Antoranz P., Backes M., Baixeras C., Balestra S., Barrio J.A, Bastieri D., J. Gonz\'e1lez B et al..\'a0 2010.\'a0\'a0Simultaneous multi-frequency observation of the unknown redshift blazar PG 1553+113 in March-April 2008. Astronomy and Astrophysics. 515:A76.\par \par }