@book { DoppelterFderalismusinEuropa,
    title = "Doppelter Föderalismus in Europa",
    subtitle = "Eine verfassungsökonomische Untersuchung",
    author = "Gerhard {Schick}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095744"
}