@book { MediationundsystemischeTherapie,
    title = "Mediation und systemische Therapie",
    author = "Jasmin {Cornelius}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00004-7",
    url = "https://www.peterlang.com/document/1054212"
}