@book { FreizgigkeitvonrzteninnerhalbderEU,
    title = "Freizügigkeit von Ärzten innerhalb der EU",
    author = "Dimitrios {Kremalis}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105519"
}