Niine, Tarvo, Ene Kolbre, Aleksandr Miina, and Malwina Dziugiel. “Innovation in the Air Cargo Sector: Case Studies of Estonia and Poland”. Transport 30, no. 4 (December 18, 2015): 421–429. Accessed November 9, 2024. https://btp.vgtu.lt/index.php/Transport/article/view/1721.