@book { RainerMariaRilkeunddasEhepaarModersohn,
    title = "Rainer Maria Rilke und das Ehepaar Modersohn",
    author = "Friederike {Daugelat}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099300"
}