@book { DieHandelssystemeXetraundElectronicCommunicationNetworksimVergleich,
    title = "Die Handelssysteme Xetra und Electronic Communication Networks im Vergleich",
    author = "Mathias {Engelmayer}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832469214",
    url = "https://m.diplom.de/document/222258"
}