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Abdo A.A, Ackermann M., Ajello M., Allafort A., Baldini L., Ballet J., Barbiellini G., Baring M.G, Bastieri D., Bechtol K. et al..\'a0 2011.\'a0\'a0Insights into the High-energy $\\gamma$-ray Emission of Markarian 501 from Extensive Multifrequency Observations in the Fermi Era\}. The Astrophysical Journal. 727:129.\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 }