@book { ElectronicCommerceundrumlicherStrukturwandel,
    title = "Electronic Commerce und räumlicher Strukturwandel",
    author = "Rainer {Jentgens}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832415747",
    url = "https://m.diplom.de/document/217416"
}