@book { WettbewerbsbeschrnkungeninderLuftfahrtindustriedurchComputerReservationSystems,
    title = "Wettbewerbsbeschränkungen in der Luftfahrtindustrie durch Computer Reservation Systems",
    author = "Olaf {Grabowski}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1114686"
}