@article{Giroletti:20074Y, author = "Giroletti, Marcello and Giovannini, Gabriele", title = "{Millimeter VLBI detection of the TeV blazar Markarian 501 }", doi = "10.22323/1.036.0074", journal = "PoS", year = 2007, volume = "8thEVN", pages = "074" }