@book { GeschwisterfrhgeborenerKinder,
    title = "Geschwister frühgeborener Kinder",
    subtitle = "Eine empirische Untersuchung",
    author = "Torben {Keuter}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832465216",
    url = "https://m.diplom.de/document/221700"
}