@book { ElementederMaundIntegrationstheorie,
    title = "Elemente der Maß- und Integrationstheorie",
    author = "Regine Stefanie {Martschiske}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/226537"
}