1. The freedom of flight;Airspace;Airspace Quarter,2017
2. Ankerst, M., Breunig, M., Kriegel, H.-P., Sander, J. 1999. OPTICS: Ordering points to identify the clustering structure. In: ACM SIGMOD international conference on Management of data. Philadelphia, USA. https://doi.org/10.1145/304182.304187.
3. Basora, L., Morio, J., Mailhot, C. 2017. A Trajectory Clustering Framework to Analyse Air Trafic Flows. In: 17th Sesar Innovation Days. Belgrade, Serbia. – HAL Id : hal-01655747.
4. Bentrup, L., Hoffmann, M. 2016. Free Routing Airspace in Europe. In: 7th International Conference on Research in Air Transportation. Philadelphia, PA.
5. Review & Perspective for Distance Based Clustering of Vehicle Trajectories;Besse;(IEEE, Hrsg.) IEEE Trans. Intelligent Transport. Syst.,2016