@book { EffizienzanalysegrundlegenderGestaltungsgrenderOPOrganisation,
    title = "Effizienzanalyse grundlegender Gestaltungsgrößen der OP-Organisation",
    author = "Anja {Zöller}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136231"
}