@article{HeuermannSchiek2009,
  author    = {Holger Heuermann and B. Schiek},
  title     = {Robust Algorithms for Txx Network Analyzer Self-Calibration Procedures},
  journal   = {IEEE transactions on instrumentation and measurement : IM / Institute of Electrical and Electronics Engineers, Instrumentation and Measurement Group. 43 (1994), H. 1},
  pages     = {18 -- 23},
  year      = {2009},
}