@book { PositiveVertragsverletzung,
    title = "Positive Vertragsverletzung",
    author = "Hans Peter {Glöckner} and Werner {Schubert}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100546"
}