@book { SubstitutionvonmateriellendurchimmaterielleAnreize,
    title = "Substitution von materiellen durch immaterielle Anreize",
    author = "Lukas {Kieromin}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832450922",
    url = "https://m.diplom.de/document/220621"
}