@book { ProductSwitchingundMarktmachtmissbrauch,
    title = "Product-Switching und Marktmachtmissbrauch",
    author = "Andreas {Schüssel}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18142",
    url = "https://www.peterlang.com/document/1059358"
}