@book { KorrektesSchlieenbeiunvollstndigerInformation,
    title = "Korrektes Schließen bei unvollständiger Information",
    author = " {Meyer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086984"
}