@article{Heuermann2009,
  author    = {Holger Heuermann},
  title     = {Calibration of a Network Analyzer Without a Thru Connection for Nonlinear and Multiport Measurements},
  journal   = {IEEE Transactions on Microwave Theory and Techniques. 56 (2008), H. 11, 1},
  pages     = {2505 -- 2510},
  year      = {2009},
}