?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Ingrid&rft.au=Rosian%2C+Ingrid&rft.aulast=Rosian&rft.btitle=Impfungen.+%C3%96konomische+Evaluation&rft.date=2003&rft.isbn=3-85159-061-9&rft.genre=book