@book { VertragsvermittlerundopportunistischesVerhalten,
    title = "Vertragsvermittler und opportunistisches Verhalten",
    author = "Henning {Curti}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100000"
}