@book { GroupDynamics,
    title = "Group Dynamics",
    author = "Uwe {Bußmann} and Silvia {Schweighofer}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842819382",
    url = "https://m.diplom.de/document/228577"
}