@article{KoetzGuentherKosmellaetal.2004,
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  year      = {2004},
  language  = {en}
}
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  year      = {1998},
  language  = {en}
}
@article{BeitzKoetzWolfetal.2001,
  author    = {Beitz, Toralf and Koetz, Joachim and Wolf, Gunter and Kleinpeter, Erich and Friberg, Stig E.},
  title     = {Poly(N-vinyl-2-pyrrolidone) and 1-octyl-2-pyrrolidinone modified ionic microemulsions},
  year      = {2001},
  language  = {en}
}