@book { EnvironmentalStrategies,
    title = "Environmental Strategies",
    author = "Joachim {Plesch}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832471019",
    url = "https://m.diplom.de/document/222420"
}