@book { EuropischesBeihilferechtundAdvancePricingAgreements,
    title = "Europäisches Beihilferecht und Advance Pricing Agreements",
    author = "Philip {Schumacher}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17804",
    url = "https://www.peterlang.com/document/1059321"
}