Aleksi? J., Antonelli L.A, Antoranz P., Backes M., Baixeras C., Barrio J.A, Bastieri D., J. González B, Bednarek W., Berdyugin A. et al..  2011.  Gamma-ray Excess from a Stacked Sample of High- and Intermediate-frequency Peaked Blazars Observed with the MAGIC Telescope. The Astrophysical Journal. 729:115.