@book { rztlicheLeitlinienindervertraglichenArzthaftung,
    title = "Ärztliche Leitlinien in der vertraglichen Arzthaftung",
    author = "Tobias {Elster}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01570-6",
    url = "https://www.peterlang.com/document/1046875"
}