@book { VariableVergtungssystemeinKreditinstituten,
    title = "Variable Vergütungssysteme in Kreditinstituten",
    author = "Oliver {Kruse}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094036"
}