@book { BearbeitungsentgelteinUnternehmerdarlehensvertrgen,
    title = "Bearbeitungsentgelte in Unternehmerdarlehensverträgen",
    author = "Tim Fabian {Walter}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17176",
    url = "https://www.peterlang.com/document/1059135"
}