@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}
}
@article{HagemannGeittnerWarnieretal.1986,
  author    = {Hagemann, Hans-J{\"u}rgen and Geittner, P. and Warnier, J. and Wilson, H.},
  title     = {PCVD at high deposition rates. Geittner, P.; Hagemann, H. J.; Warnier, J.; Wilson, H.},
  series = {Journal of Lightwave Technology (J-LT) / Institute of Electrical and Electronics Engineers (IEEE). 4 (1986), H. 7},
  journal   = {Journal of Lightwave Technology (J-LT) / Institute of Electrical and Electronics Engineers (IEEE). 4 (1986), H. 7},
  isbn      = {0733-8724},
  pages     = {818 -- 822},
  year      = {1986},
  language  = {en}
}
@article{HagemannStumpeWagneretal.1985,
  author    = {Hagemann, Hans-J{\"u}rgen and Stumpe, R. and Wagner, D. and B{\"a}uerle, D.},
  title     = {The influence of contact effects on the dielectric behavior of diffuse phase transitions. Stumpe, R.; Wagner, D.; B{\"a}uerle, D.; Hagemann, H. J.},
  series = {Ferroelectrics : the international journal devoted to the theoretical, experimental, and applied aspects of ferroelectrics and related materials / Letters section. 4 (1985)},
  journal   = {Ferroelectrics : the international journal devoted to the theoretical, experimental, and applied aspects of ferroelectrics and related materials / Letters section. 4 (1985)},
  isbn      = {0731-5171},
  pages     = {143 -- 147},
  year      = {1985},
  language  = {en}
}
@article{HagemannGeittnerWarnieretal.1985,
  author    = {Hagemann, Hans-J{\"u}rgen and Geittner, P. and Warnier, J. and Weling, F.},
  title     = {Reduction of geometric taper losses in the PCVD process. Geittner, P.; Hagemann, H. J.; Warnier, J.; Weling, F.; Wilson, H.},
  series = {Electronics letters : an intern. publication / The Institution of Electrical Engineers. 21 (1985), H. 13},
  journal   = {Electronics letters : an intern. publication / The Institution of Electrical Engineers. 21 (1985), H. 13},
  isbn      = {0013-5194},
  pages     = {870 -- 871},
  year      = {1985},
  language  = {en}
}
@article{HagemannGeittnerLeers1989,
  author    = {Hagemann, Hans-J{\"u}rgen and Geittner, P. and Leers, D.},
  title     = {Intrinsic scattering and absorption losses of Ge- and F-doped optical fibres prepared by PCVD. Geittner, P.; Hagemann, H. J. ; Leers, D.},
  series = {Electronics letters : an intern. publication / The Institution of Electrical Engineers. 25 (1989), H. 7},
  journal   = {Electronics letters : an intern. publication / The Institution of Electrical Engineers. 25 (1989), H. 7},
  isbn      = {0013-5194},
  pages     = {436 -- 437},
  year      = {1989},
  language  = {en}
}
@article{HagemannHennings1981,
  author    = {Hagemann, Hans-J{\"u}rgen and Hennings, D.},
  title     = {Reversible Weight change of acceptor-doped BaTiO3. Hagemann, H. J.; Hennings, D.},
  series = {Journal of the American Ceramic Society. 64 (1981)},
  journal   = {Journal of the American Ceramic Society. 64 (1981)},
  isbn      = {0002-7820},
  pages     = {590 -- 594},
  year      = {1981},
  language  = {en}
}
@article{HagemannHenningsWernicke1984,
  author    = {Hagemann, Hans-J{\"u}rgen and Hennings, D. and Wernicke, R.},
  title     = {Ceramic multilayer capacitors. Hagemann, H. J.; Hennings, D.; Wernicke, R.},
  series = {Philips' technical review / Philips' Gloeilampenfabrieken. Philips' Gloeilampenfabrieken <Eindhoven>. 41 (1984)},
  journal   = {Philips' technical review / Philips' Gloeilampenfabrieken. Philips' Gloeilampenfabrieken <Eindhoven>. 41 (1984)},
  isbn      = {0031-7926},
  pages     = {89 -- 98},
  year      = {1984},
  language  = {en}
}
@article{HagemannHenningsWernicke1984,
  author    = {Hagemann, Hans-J{\"u}rgen and Hennings, D. and Wernicke, R.},
  title     = {Keramische Vielschichtkondensatoren. Hagemann, H. J.; Hennings, D.; Wernicke, R.},
  series = {Sprechsaal : internat. ceramics \& glass magazine. 117 (1984)},
  journal   = {Sprechsaal : internat. ceramics \& glass magazine. 117 (1984)},
  isbn      = {0341-0439},
  pages     = {924 -- 931},
  year      = {1984},
  language  = {de}
}
@article{HagemannGeittnerSchnittkeretal.1989,
  author    = {Hagemann, Hans-J{\"u}rgen and Geittner, P. and Schnittker, W. and Warnier, J.},
  title     = {Abscheidegeschwindigkeiten und Prozeßausbeuten im PCVD-Verfahren. Geittner, P.; Hagemann, H. J.; Schnittker, W.; Warnier, J.; Weling, F.; Wilson, H.},
  series = {Philips - Unsere Forschung in Deutschland / Hrsg.: Philips Forschungslaboratorium GmbH Aachen und Hamburg. 4 (1989)},
  journal   = {Philips - Unsere Forschung in Deutschland / Hrsg.: Philips Forschungslaboratorium GmbH Aachen und Hamburg. 4 (1989)},
  pages     = {140 -- 143},
  year      = {1989},
  language  = {de}
}
@article{Hagemann1989,
  author    = {Hagemann, Hans-J{\"u}rgen},
  title     = {St{\"o}rstellengleichgewichte in eisendotierten Titanaten. Hagemann, H. J.},
  series = {Philips - Unsere Forschung in Deutschland / Hrsg.: Philips Forschungslaboratorium GmbH Aachen und Hamburg. 4 (1989)},
  journal   = {Philips - Unsere Forschung in Deutschland / Hrsg.: Philips Forschungslaboratorium GmbH Aachen und Hamburg. 4 (1989)},
  pages     = {170 -- 172},
  year      = {1989},
  language  = {de}
}
@article{HagemannHeroGonser1980,
  author    = {Hagemann, Hans-J{\"u}rgen and Hero, A. and Gonser, U.},
  title     = {The valence change of Fe in BaTiO3 studied by M{\"o}ßbauer effect and gravimetry. Hagemann, H. J.; Hero, A.; Gonser, U.},
  series = {Physica Status Solidi (A) - Applied Research. 61 (1980)},
  journal   = {Physica Status Solidi (A) - Applied Research. 61 (1980)},
  isbn      = {0031-8965},
  pages     = {63 -- 72},
  year      = {1980},
  language  = {en}
}
@article{HagemannIhrig1979,
  author    = {Hagemann, Hans-J{\"u}rgen and Ihrig, H.},
  title     = {Valence change and phase stability of 3d-doped BaTiO3 annealed in oxygen and hydrogen. Hagemann, H. J.; Ihrig, H.},
  series = {Physical Review B.. 20 (1979), H. 9},
  journal   = {Physical Review B.. 20 (1979), H. 9},
  isbn      = {1095-3795},
  pages     = {3871 -- 3878},
  year      = {1979},
  language  = {en}
}
@book{Hagemann1980,
  author    = {Hagemann, Hans-J{\"u}rgen},
  title     = {Akzeptorionen in BaTiO3 und SrTiO3 und ihre Auswirkungen auf die Eigenschaften von Titanatkeramiken},
  pages     = {IX, 145 S. : zahlr. graph. Darst.},
  year      = {1980},
  language  = {de}
}
@article{HagemannIhrig1980,
  author    = {Hagemann, Hans-J{\"u}rgen and Ihrig, H.},
  title     = {BaTiO3 dotiert mit 3d-Ionen: Valenzen, Leerstellen und ihre Auswirkungen. Hagemann, H. J.; Ihrig, H.},
  series = {Philips - Unsere Forschung in Deutschland / Hrsg.: Philips Forschungslaboratorium GmbH Aachen und Hamburg. 3 (1980)},
  journal   = {Philips - Unsere Forschung in Deutschland / Hrsg.: Philips Forschungslaboratorium GmbH Aachen und Hamburg. 3 (1980)},
  pages     = {249 -- 252},
  year      = {1980},
  language  = {de}
}
@article{Hagemann1978,
  author    = {Hagemann, Hans-J{\"u}rgen},
  title     = {Loss mechanisms and domain stabilization in doped BaTiO₃},
  series = {Journal of Physics C: Solid State Physics},
  volume    = {11},
  journal   = {Journal of Physics C: Solid State Physics},
  number    = {15},
  publisher = {n.a.},
  address   = {London},
  isbn      = {0022-3719},
  doi       = {10.1088/0022-3719/11/15/031},
  pages     = {3333 -- 3344},
  year      = {1978},
  language  = {en}
}
@article{Hagemann1978,
  author    = {Hagemann, Hans-J{\"u}rgen},
  title     = {Electrical properties of acceptor-doped BaTiO3 ceramic. Hagemann, H. J.},
  series = {Berichte der Deutschen Keramischen Gesellschaft. 55 (1978)},
  journal   = {Berichte der Deutschen Keramischen Gesellschaft. 55 (1978)},
  isbn      = {0365-9542},
  pages     = {353 -- 355},
  year      = {1978},
  language  = {en}
}
@article{HagemannGeittnerMayretal.1993,
  author    = {Hagemann, Hans-J{\"u}rgen and Geittner, P. and Mayr, W. and Opitz, J. F. A.},
  title     = {Folientechnologie f{\"u}r zuk{\"u}nftige keramische Vielschichtkondensatoren. Geittner, P.; Hagemann, H.-J.;Mayr, W. ; Opitz, J.F.A. ; Schmidl, B.; Warnier, J.},
  series = {Ceramic forum international : cfi ; Berichte der Deutschen Keramischen Gesellschaft. 8 (1993), H. 5},
  journal   = {Ceramic forum international : cfi ; Berichte der Deutschen Keramischen Gesellschaft. 8 (1993), H. 5},
  isbn      = {0173-9913},
  pages     = {5 -- 15},
  year      = {1993},
  language  = {de}
}
@article{Hagemann1978,
  author    = {Hagemann, Hans-J{\"u}rgen},
  title     = {Reduction of hysteresis losses of ferroelectric BaTiO3. Hagemann, H. J.},
  series = {Ferroelectrics. 22 (1978)},
  journal   = {Ferroelectrics. 22 (1978)},
  isbn      = {0015-0193},
  pages     = {743 -- 743},
  year      = {1978},
  language  = {en}
}
@article{HagemannGudatKunz1974,
  author    = {Hagemann, Hans-J{\"u}rgen and Gudat, W. and Kunz, C.},
  title     = {Photoabsorption of alloys of Al with transition metals V, Fe, Ni and Cu and Pr near the Al L₂,₃-edge},
  series = {Solid State Communications},
  volume    = {15},
  journal   = {Solid State Communications},
  number    = {3},
  publisher = {Elsevier},
  address   = {Amsterdam},
  isbn      = {0038-1098},
  doi       = {10.1016/0038-1098(74)91165-X},
  pages     = {655 -- 658},
  year      = {1974},
  abstract  = {The onset of Al 2p transitions of VAl₃, FeAl, NiAl, NiAl₃, CuAl₂, PrAl₂ and the disordered alloys V-Al (16 at \% Al, 28\%, 41\%), Fe-Al (11\%) is shifted up to 1.1 eV. New pronounced structure develops close to the onset which for NiAl agrees with a density of states calculation by Connolly and Johnson.},
  language  = {en}
}
@article{HagemannGudatKunz1975,
  author    = {Hagemann, Hans-J{\"u}rgen and Gudat, W. and Kunz, C.},
  title     = {Optical constants from the far infrared to the X-ray region: Mg, Al, Cu, Ag, Au, Bi, C, and Al₂O₃},
  series = {Journal of the Optical Society of America (JOSA)},
  volume    = {65},
  journal   = {Journal of the Optical Society of America (JOSA)},
  number    = {6},
  publisher = {Optical Society of America},
  address   = {New York},
  isbn      = {0030-3941},
  doi       = {10.1364/JOSA.65.000742},
  pages     = {742 -- 744},
  year      = {1975},
  language  = {en}
}