@book { WAP,
    title = "WAP",
    subtitle = "Grundlagen der mobilen Kommunikation sowie informationstechnische Aspekte des Wireless Applikation Protocols",
    author = "Albert {Unterpirker}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832425296",
    url = "https://m.diplom.de/document/218322"
}