@book { ThemeasurementofchangesinrealincomeunderconditionsofrationingintheUnitedStatesduringWorldWarII,
    title = "The measurement of changes in real income under conditions of rationing in the United States during World War II",
    author = "Matthias {Heilmann}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832472214",
    url = "https://m.diplom.de/document/222525"
}