@book { RadicalProductInnovationinNetworkEconomies,
    title = "Radical Product Innovation in Network Economies",
    subtitle = "Lessons for M-Commerce",
    author = "Philipp {Leutiger}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832456580",
    url = "https://m.diplom.de/document/221138"
}