@book { TheUseofKeyFiguresanditsImpactonActivity,
    title = "The Use of Key Figures and its Impact on Activity",
    subtitle = "The Case of a Hospital",
    author = "Anja {Kern}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105217"
}