@book { BerechnungsmethodendesProduktionspotenzials,
    title = "Berechnungsmethoden des Produktionspotenzials",
    author = "Steffen {Walther}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103785"
}