@book{UBHD-69054024,
  title={Literature 1997, Part 1},
  publisher={Springer Berlin Heidelberg},
  address={Berlin, Heidelberg ; s.l.},
  year={1998},
  pages={Online-Ressource (XXXV, 1740 p)},
  language={eng},
  isbn={978-3-642-51758-7},
  number={ARRAY(0x562e01e85dd0)},
  series={Astronomy and astrophysics abstracts},
  doi={10.1007/978-3-642-51758-7},
}
@book{UBHD-2122743,
  author={Schubart, Joachim and Zech, Gert},
  title={Determination of the astronomical unit by the dynamical method},
  publisher={Astronomisches Recheninstitut},
  address={Heidelberg},
  year={1967},
  pages={1 Bl.},
  language={eng},
  number={ARRAY(0x562e02286418)},
  series={Mitteilungen / Astronomisches Recheninstitut in Heidelberg},
  note={Reprinted from Nature ; 214.1967,5091},
  library={UB [Signatur: 68 R 230]},
}
@book{UBHD-2133350,
  author={Zech, Gert},
  title={The determination of the mass of the earth + moon system by dynamical method from observations of Eros},
  publisher={Braun},
  address={Karlsruhe},
  year={1968},
  pages={36 S.},
  language={eng},
  number={ARRAY(0x562e023d0ef0)},
  series={Ver{\"o}ffentlichungen des Astronomischen Rechen-Instituts Heidelberg},
  library={UB [Signatur: 68 S 95] ; AR [Signatur: PY/US 1090 A859-21]},
}
@book{UBHD-2222656,
  author={Zech, Gert},
  title={Die Massenbestimmung des Systems Erde - Mond aus Beobachtungen des Eros nach der dynamischen Methode},
  year={1968},
  pages={64 Bl.},
  language={ger},
  school={Heidelberg, Univ., Diss., 1968},
  library={UB [Signatur: 68 Q 737]},
}