@book { OkavangoDeltaeinekologischeOase,
    title = "Okavango-Delta - eine ökologische Oase?",
    author = "Marcus {Deuchler}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638571272",
    url = "https://www.hausarbeiten.de/document/64258"
}