@article{Groenke1997,
  author    = {Gr{\"o}nke, Ottokar},
  title     = {Samenpflanzen},
  isbn      = {3-06-010522-7},
  year      = {1997},
  language  = {de}
}
@article{Groenke1997,
  author    = {Gr{\"o}nke, Ottokar},
  title     = {Pflanzenfamilien},
  isbn      = {3-06-010523-5},
  year      = {1997},
  language  = {de}
}
@article{Groenke1997,
  author    = {Gr{\"o}nke, Ottokar},
  title     = {Symjency},
  isbn      = {3-7420-1115-4},
  year      = {1997},
  language  = {mul}
}
@article{Groenke1997,
  author    = {Gr{\"o}nke, Ottokar},
  title     = {Samenpflanzen},
  isbn      = {3-06-010523-5},
  year      = {1997},
  language  = {de}
}
@article{Groenke1997,
  author    = {Gr{\"o}nke, Ottokar},
  title     = {Pflanzenfamilien},
  isbn      = {3-06-010522-7},
  year      = {1997},
  language  = {de}
}