@book { Developingrulesandprinciplesforpreparingandimplementingacquisitionprojects,
    title = "Developing rules and principles for preparing and implementing acquisition projects",
    author = "Thorsten {Mühl}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832441104",
    url = "https://m.diplom.de/document/219734"
}