@book { ExistenzundGrenzsituation,
    title = "Existenz und Grenzsituation",
    author = "Daniel {Gerte}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b19200",
    url = "https://www.peterlang.com/document/1161518"
}