@book { KundenintegrationbeiDienstleistungen,
    title = "Kundenintegration bei Dienstleistungen",
    author = "Simon {Lendner}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02884-3",
    url = "https://www.peterlang.com/document/1046086"
}