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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 }