@book { KarteninterpretationL4128Goslar,
    title = "Karteninterpretation L 4128 Goslar",
    author = "Matthias {Schopp}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638018968",
    url = "https://www.hausarbeiten.de/document/86070"
}