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@ARTICLE{Poerschke:129994,
      author       = {Poerschke, R. and Wollenberger, H.},
      title        = {{A} helium-cooled magnetic amplifier for d c measurements
                      in the picovolt range},
      journal      = {Cryogenics : low temperature engineering, applied super
                      conductivity, cryoelectronics, cryophysics},
      volume       = {10},
      number       = {4},
      issn         = {0011-2275},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {RWTH-CONV-011168},
      pages        = {333-335},
      year         = {1970},
      cin          = {520000 / 523110},
      cid          = {$I:(DE-82)520000_20140620$ / $I:(DE-82)523110_20140620$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:A1970G901400015},
      doi          = {10.1016/0011-2275(70)90067-6},
      url          = {https://publications.rwth-aachen.de/record/129994},
}