Peter L. Biermann (1 and 2), Gustavo Medina Tanco (3), Ralph Engel (4), Giovanna Pugliese (5) ((1) Max-Planck Inst. for Radioastronomy, (2) Dept. Phys. and Astron., Univ. of Bonn, Germany, (3) Instituto Astron. e Geof., USP, Brasil, (4) Forschungszentrum Karlsruhe, Karlsruhe, Germany, (5) European Southern Obs., Munich, Germany)
