@book { KookkurrenzKovariationKontrast,
    title = "Kookkurrenz – Kovariation – Kontrast",
    author = "Philip C. {Vergeiner}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15186",
    url = "https://www.peterlang.com/document/1056657"
}