@book { DieeinseitigenderungvonArbeitsbedingungen,
    title = "Die einseitige Änderung von Arbeitsbedingungen",
    author = "Philipp {Ballering}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097501"
}