Drupka, Grzegorz, Andrzej Majka, Tomasz Rogalski, and Leszek Trela. “An Airspace Model Aplicable for Automatic Flight Route Planning Inside Free Route Airspace”. Advances in Mechanical and Materials Engineering 35, no. 298 (1) (April 28, 2018): 5-18. Accessed November 21, 2024. https://czasopisma.prz.edu.pl/amme/article/view/1227.