@book { UnitedinDiversityEuropischeSolidarittimKrisenfall,
    title = "United in Diversity. Europäische Solidarität im Krisenfall",
    author = "Elias {Wolff}",
    year = "2023",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/1342956"
}