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Blasi M.G, Lico R., Giroletti M., Orienti M., Giovannini G., Cotton W., Edwards P.G, Fuhrmann L., Krichbaum T.P, Kovalev Y.Y et al..\'a0 2013.\'a0\'a0The TeV blazar Markarian 421 at the highest spatial resolution. Astronomy and Astrophysics. 559:A75.\par \par Lico R., Giroletti M., Orienti M., Giovannini G., Cotton W., Edwards P.G, Fuhrmann L., Krichbaum T.P, Sokolovsky K.V, Kovalev Y.Y et al..\'a0 2012.\'a0\'a0VLBA monitoring of Mrk 421 at 15 GHz and 24 GHz during 2011. Astronomy and Astrophysics. 545:A117.\par \par Abdo A.A, Ackermann M., Ajello M., Baldini L., Ballet J., Barbiellini G., Bastieri D., Bechtol K., Bellazzini R., Berenji B. et al..\'a0 2011.\'a0\'a0Fermi Large Area Telescope Observations of Markarian 421: The Missing Piece of its Spectral Energy Distribution. The Astrophysical Journal. 736:131.\par \par 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 }