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@article{PietschmannVahs1996,
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@article{PietschmannVahs1996,
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@article{PietschmannRuhtz2001,
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@article{PietschTaudes1994,
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@article{PietschSteinbauer1994,
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@article{PietschKurbelJung1996,
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  publisher = {Springer},
  address   = {Berlin [u.a.]},
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}