@book { OnCompetitionandRegulationinHealthCareSystems,
    title = "On Competition and Regulation in Health Care Systems",
    author = "Robert {Nuscheler}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13723",
    url = "https://www.peterlang.com/document/1068302"
}