@book { VergleichvonWorkflowManagementSystemenaufOpenSourceBasis,
    title = "Vergleich von Workflow Management Systemen auf Open Source Basis",
    author = "Oliver {Königs}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842823617",
    url = "https://m.diplom.de/document/228730"
}