@book { ERPSystemeundWorkflowmanagement,
    title = "ERP-Systeme und Workflowmanagement",
    author = "Sebastian {Aha}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656150350",
    url = "https://www.hausarbeiten.de/document/190467"
}