@book { RohstoffeimKaspischenBecken,
    title = "Rohstoffe im Kaspischen Becken",
    author = "Alexander {Brexendorff}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101245"
}