@book { VertragshaftungundDrittschutz,
    title = "Vertragshaftung und Drittschutz",
    author = "Alexander {Ostrowicz}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1072305"
}