@book { KarteninterpretationL6706SaarbrckenWest,
    title = "Karteninterpretation L6706 Saarbrücken-West",
    author = "Matthias {Schopp}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638860352",
    url = "https://www.hausarbeiten.de/document/81132"
}