@book { WettbewerbimGesundheitswesenChancenundGrenzen,
    title = "Wettbewerb im Gesundheitswesen: Chancen und Grenzen",
    author = "Eberhard {Wille} and Klaus {Knabner}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14113",
    url = "https://www.peterlang.com/document/1068638"
}