@book { VariationandCooperativeCommunicationStrategiesinAirTrafficControlEnglish,
    title = "Variation and Co-operative Communication Strategies in Air Traffic Control English",
    author = "Eveline {Wyss - Bühlmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1096979"
}