@article{193036,
      author       = "Ahmed, F. and Václavovic, P. and Teferle, F.N. and Douša,
                      J. and Bingley, R. and Laurichesse, D.",
      title        = "Comparative analysis of real-time precise point positioning
                      zenith total delay estimates",
      note         = "This article is published with open access at
                      Springerlink.com",
}