@book { EfficientConsumerResponse,
    title = "Efficient Consumer Response",
    author = "Dirk {Schäfer}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832422592",
    url = "https://m.diplom.de/document/218077"
}