@article{HagemannGeittner1990,
  author    = {Hagemann, Hans-J{\"u}rgen and Geittner, P.},
  title     = {PCVD hybrid technology for single mode fibres. Hagemann, H. J.; Geittner, P.},
  series = {Proceedings : papers presented at: the 8th Annual European Fibre Optic Communications and Local Area Networks Exposition},
  journal   = {Proceedings : papers presented at: the 8th Annual European Fibre Optic Communications and Local Area Networks Exposition},
  pages     = {67 -- 72},
  year      = {1990},
  language  = {en}
}
@article{HagemannUngelenkWiechert1990,
  author    = {Hagemann, Hans-J{\"u}rgen and Ungelenk, J. and Wiechert, D. U.},
  title     = {Optical time domain reflectometry (OTDR) of diameter modulations in single-mode fibers. Hagemann, H. J.; Ungelenk, J.; Wiechert, D. U.},
  series = {Journal of Lightwave Technology (J-LT) / Institute of Electrical and Electronics Engineers (IEEE). 8 (1990), H. 11},
  journal   = {Journal of Lightwave Technology (J-LT) / Institute of Electrical and Electronics Engineers (IEEE). 8 (1990), H. 11},
  isbn      = {0733-8724},
  pages     = {1641 -- 1645},
  year      = {1990},
  language  = {en}
}