@article{HeuermannSchiek2009,
  author    = {Holger Heuermann and Burkhard Schiek},
  title     = {Line Network Network (LNN): an alternative in-fixture calibration procedure},
  journal   = {IEEE transactions on microwave theory and techniques : MTT ; a publication of the IEEE Microwave Theory and Techniques Society. 45 (1997), H. 3},
  pages     = {408 -- 413},
  year      = {2009},
}