@book { TheoriesofContagion,
    title = "Theories of Contagion",
    author = "Andreas {Vester}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832498733",
    url = "https://m.diplom.de/document/224990"
}