@book { 500JahreFriedrichIvonDnemark,
    title = "500 Jahre Friedrich I. von Dänemark",
    subtitle = "Auf den herzoglichen Spuren des Königs aus Schleswig-Holstein",
    author = "Oliver {Auge} and Stefan {Magnussen}",
    year = "2025",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b22459",
    url = "https://www.peterlang.com/document/1503468"
}