@book { EntgeltregelungenundWirtschaftsrisiko,
    title = "Entgeltregelungen und Wirtschaftsrisiko",
    author = "Markus {Weingarth}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1135739"
}