@article{UBHD-69007705,
  author={Lippolt, Hans J. and Hautmann, Siegfried},
  title={40Ar/39Ar ages of Precambrian manganese ore minerals from Sweden, India and Morocco},
  year={1995},
  pages={246-256},
  language={eng},
  issn={1432-1866},
  volume={30},
  number={3},
  note={Im Titel sind die Zahlen 40 und 39 jeweils hochgestellt ; Gesehen am 18.01.2023},
  journal={Mineralium deposita},
  doi={10.1007/BF00196360},
}
@article{UBHD-69036379,
  author={Lippolt, Hans J. and Hradetzky, Helmuth and Hautmann, Siegfried},
  title={K-Ar dating of amphibole-bearing rocks in the Schwarzwald, SW Germany},
  subtitle={I: 40Ar/39Ar age constraints to Hercynian HT-metamorphism$dHans-Joachim Lippolt, Helmuth Hradetzky, Siegfried Hautmann},
  year={1994},
  pages={433-448},
  language={ger},
  issn={0028-3649},
  number={10},
  journal={Neues Jahrbuch f{\"u}r Mineralogie},
  keywords={Mineralogie / Schwarzwald},
}