@book { OptimierungimAirlineRevenueManagement,
    title = "Optimierung im Airline Revenue Management",
    author = "Christoph {Winkler}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03817-0",
    url = "https://www.peterlang.com/document/1047853"
}