@book { StrategischeAllianzenimLuftverkehr,
    title = "Strategische Allianzen im Luftverkehr",
    author = "Frithjof {Netzer}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13643",
    url = "https://www.peterlang.com/document/1068241"
}