@book{KempterJumar1991,
  author    = {Kempter, Gerhard and Jumar, Alfred},
  title     = {Chemie organischer Pflanzenschutz- und Sch{\"a}dlingsbek{\"a}mpfungsmittel},
  publisher = {Dt. Verl. d. Wiss.},
  address   = {Berlin},
  pages     = {131 S.},
  year      = {1991},
  language  = {de}
}
@book{Kempter1991,
  author    = {Kempter, Gerhard},
  title     = {Organisch-chemisches Praktikum},
  series = {Studienb{\"u}cherei : Chemie f{\"u}r Lehrer},
  volume    = {1},
  journal   = {Studienb{\"u}cherei : Chemie f{\"u}r Lehrer},
  publisher = {Dt. Verl. d. Wiss.},
  address   = {Berlin},
  pages     = {303 S.},
  year      = {1991},
  language  = {de}
}
@article{KempterSarodnick1991,
  author    = {Kempter, Gerhard and Sarodnick, Gerhard},
  title     = {Synthese von Pyrazolyl- und Pyrimidinylchinoxalinen},
  year      = {1991},
  language  = {de}
}
@article{SchroederKuemmelMickleretal.1991,
  author    = {Schr{\"o}der, Martina and K{\"u}mmel, Rolf and Mickler, Wulfhard and Uhlemann, Erhard},
  title     = {Zur Abtrennung von Kupfer aus ammoniakalischer L{\"o}sung durch Fl{\"u}ssig-Fl{\"u}ssig-Extraktion und Fl{\"u}ssigmembranpermeation mit 1-Phenyl-3-methyl-4-stearoylpyrazol-5-on},
  year      = {1991},
  language  = {de}
}
@book{OPUS4-29390,
  title     = {Chemical Physics},
  editor    = {Z{\"u}licke, Lutz},
  publisher = {Elsevier},
  address   = {Amsterdam [u.a.]},
  year      = {1991},
  language  = {en}
}