@book{HardtSchiffer1985,
  author    = {Hardt, Arno and Schiffer, Willi},
  title     = {Vermessung der statischen Eigenschaften eines dreidimensionalen Koordinatenmeßtisches / von W. Schiffer ; A. Hardt. [KFA, Kernforschungsanlage J{\"u}lich GmbH, Projekt Spallations-Neutronenquelle]},
  publisher = {Zentralbibliothek d. Kernforschungsanlage},
  address   = {J{\"u}lich},
  pages     = {65 S. : graph. Darst.},
  year      = {1985},
  language  = {de}
}
@book{Hardt1985,
  author    = {Hardt, Arno},
  title     = {Vermessung der dynamischen Eigenschaften eines dreiachsigen Koordinatenmesstisches},
  publisher = {Kernforschungsanlage J{\"u}lich},
  address   = {J{\"u}lich},
  pages     = {107 S.},
  year      = {1985},
  language  = {de}
}
@article{BalewskiBrauksiepeHardt1997,
  author    = {Balewski, J. and Brauksiepe, S. and Hardt, Arno},
  title     = {Threshold measurements at the internal experimental facility COSY-11 / J. Balewski [u.a.]},
  series = {Nuclear physics A. Vol. 626, iss. 1-2},
  journal   = {Nuclear physics A. Vol. 626, iss. 1-2},
  issn      = {1873-1554 (E-Journal) ; 0375-9474 (Print)},
  pages     = {85 -- 92},
  year      = {1997},
  language  = {en}
}
@article{MartinHardtMeissburgeretal.1983,
  author    = {Martin, Siegfried A. and Hardt, Arno and Meissburger, J{\"u}rgen and Berg, Georg P. A. and Hacker, Ulrich and H{\"u}rlimann, Werner and R{\"o}mer, Josef G. M. and Sagefka, Thomas and Retz, Adolf and Schult, Otto W. B.},
  title     = {The QQDDQ magnet spectrometer "BIG KARL"},
  series = {Nuclear instruments and methods in physics research. Vol. 214, iss. 2-3},
  journal   = {Nuclear instruments and methods in physics research. Vol. 214, iss. 2-3},
  issn      = {0029-554x (E-Journal); 1872-9606 (E-Journal); 0167-5087 (Print)},
  pages     = {281 -- 303},
  year      = {1983},
  language  = {en}
}
@article{HardtMartinMeissburgeretal.1978,
  author    = {Hardt, Arno and Martin, S. and Meißburger, J. and Retz, R. and Wimmer, J.},
  title     = {The cryopump system of the QQDDQ magnet spectrometer BIG KARL},
  series = {Vacuum},
  volume    = {28},
  journal   = {Vacuum},
  number    = {10-11},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1879-2715 (E-Journal); 0042-207X (Print)},
  doi       = {10.1016/S0042-207X(78)80026-8},
  pages     = {483},
  year      = {1978},
  abstract  = {Cryopumps without liquid nitrogen shielding are used to provide a vacuum of 10-6 torr in the spectrometer. The vacuum system is subdivided in three sections that can be separated by valves. The first section (scattering chamber) has a volume of 60 l, two rotation transmissions with 35 cm dia and a sliding seal that allows a rotation of 160° without deteriorating the vacuum. The second section includes the vacuum chambers inside the magnets with 6 × 80 cm cross-section and a length of 1200 cm. The third section (detector box) has a volume of 4300 l and contains a moveable detector system. The gas inside the detector with a pressure of 760 torr is separated from the vacuum by a 15 μm mylar foil with an area of 300 cm2. The detector box can be valved off by a valve with the dimension of 10 × 100 cm. The layout of system is given. The instrumentation and the interlock system are described. First experiences with this system are presented.},
  language  = {en}
}
@book{BergGaulHagedoornetal.1984,
  author    = {Berg, G. and Gaul, G. and Hagedoorn, H. and Hardt, Arno and Heide, J. A. van der and Hinterberger, F. and Huber, Max and Jahn, R. and Martin, S. and Mayer-Kuckuk, T. and Osterfeld, F. and Paetz gen. Schieck, H. and Prasuhn, D. and Riepe, G. and Rogge, M. and Rossen, P. von and Schult, O. W. B. and Speth, J. and Turek, P.},
  title     = {Studie zum Bau eines kombinierten K{\"u}hler-Synchrotron-Rings an der KFA J{\"u}lich: COSY-Studie. Spezielle Berichte der Kernforschungsanlage J{\"u}lich. Nr. 0242. J{\"u}l-Spez-242},
  publisher = {Kernforschungsanlage},
  address   = {J{\"u}lich},
  pages     = {65 S.},
  year      = {1984},
  language  = {de}
}
@article{SchultSistemichHardt1995,
  author    = {Schult, O. W. B. and Sistemich, K. and Hardt, Arno},
  title     = {Plans for investigations of subthreshold K+ production in p+A collisions / O. W. B. Schult [u.a.]},
  series = {Nuclear Physics A. Vol. 583},
  journal   = {Nuclear Physics A. Vol. 583},
  issn      = {1873-1554 (E-journal); 0375-9474 (Print)},
  pages     = {629 -- 632},
  year      = {1995},
  language  = {en}
}
@article{HardtBisplinghoffErnstetal.1977,
  author    = {Hardt, Arno and Bisplinghoff, J. and Ernst, J. and L{\"o}hr, R.},
  title     = {On-line apparatus BANDIT for half-life determination of short-lived neutron deficient isotopes. A. Hardt, J. Bisplinghoff, J. Ernst, R. L{\"o}hr, H. Machner, T . Mayer-Kuckuk},
  series = {Nuclear Instruments and Methods. 143 (1977), H. 3},
  journal   = {Nuclear Instruments and Methods. 143 (1977), H. 3},
  isbn      = {0029-554X},
  pages     = {519 -- 523},
  year      = {1977},
  language  = {en}
}
@article{BechstedtHaasHackeretal.1985,
  author    = {Bechstedt, U. and Haas, H. and Hacker, U. and Hardt, Arno and Henn, K. and Martin, S. and Wimmer, J.},
  title     = {Magnets for the German Spallation Source SNQ},
  series = {IEEE transactions on nuclear science. Vol. 32, iss. 5},
  journal   = {IEEE transactions on nuclear science. Vol. 32, iss. 5},
  issn      = {1558-1578 (E-Journal); 0018-9499 (Print)},
  pages     = {3631 -- 3633},
  year      = {1985},
  language  = {en}
}
@article{MakovickaGaertnerHardtetal.1997,
  author    = {Makovicka, C. and G{\"a}rtner, G. and Hardt, Arno and Hermann, W. and Wiechert, D. U.},
  title     = {Impregnated cathode surface investigations by SFM/STM and SEM/EDX},
  series = {Applied surface science. Vol. 111},
  journal   = {Applied surface science. Vol. 111},
  issn      = {1873-5584 (E-Journal); 0169-4332 (Print)},
  pages     = {70 -- 75},
  year      = {1997},
  language  = {en}
}