@book { CaseManagement,
    title = "Case-Management",
    author = "Yen {Sandjaja}",
    year = "2004",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638309318",
    url = "https://www.hausarbeiten.de/document/29423"
}