@book { DieverdecktenEffizienzwirkungenderUmsatzsteuer,
    title = "Die verdeckten Effizienzwirkungen der Umsatzsteuer",
    author = "Peter {Gottfried}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13764",
    url = "https://www.peterlang.com/document/1068344"
}