K. E. Gabanyi (1,2), N. Marchili (1), T. P. Krichbaum (1), S. Britzen
  (1), L. Fuhrmann (1), A. Witzel (1), J. A. Zensus (1), P. Muller (1), X. Liu
  (3), H. G. Song (3), J. L. Han (4), X. H. Sun (4) ((1) Max-Planck-Institut
  fur Radioastronomie, (2) Hungarian Academy of Sciences, Research Group for
  Physical Geodesy and Geodynamics, (3) Urumqi Observatory, the National
  Astronomical Observatories, the Chinese Academy of Sciences, (4) National
  Astronomical Observatories, Chinese Academy of Sciences)