@book { DieHarmonisierungdesUmweltschutzesinderEuropischenUnion,
    title = "Die Harmonisierung des Umweltschutzes in der Europäischen Union",
    author = "Klaus {Eckrich}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1114883"
}