@book { GerontologieGeriatrieundGerontopsychiatrie, title = "Gerontologie, Geriatrie und Gerontopsychiatrie", author = "Siegfried {Steidl} and Bernhard {Nigg}", year = "2014", publisher = "facultas", address = "Wien, Austria", url = "https://campus-lizenzen.facultas.at/document/960436" }