WASET
    D. Tloczynski,  Benefits of Polish Accession to the European Union for Air Transport.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2015, vol. 98(2). 567 - 572
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10000626.