@book { PeterJosephKrahe,
    title = "Peter Joseph Krahe",
    author = "Gerd {Biegel} and Harmen H. {Thies}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1117773"
}