@book { ConsumptionBehaviorComparisonofSPARandLIDL,
    title = "Consumption Behavior  -  Comparison of SPAR and LIDL",
    author = "Niklas {Kürten}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638856553",
    url = "https://www.hausarbeiten.de/document/79088"
}