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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 }