@book { VariationimRaum,
    title = "Variation im Raum",
    author = "Alexandra N. {Lenz} and Edgar {Radtke} and Simone {Zwickl}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097608"
}