@book { DiezweigliedrigeBGBGesellschaft,
    title = "Die zweigliedrige BGB-Gesellschaft",
    author = "Hermann {Raible}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099886"
}