@book { StaatshaushalteindenEUBeitrittslndern,
    title = "Staatshaushalte in den EU-Beitrittsländern",
    author = "Stefan {Dietrich}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832488109",
    url = "https://m.diplom.de/document/223990"
}