On global space powers

HROZENSKÝ, Tomáš - KAZANSKÝ, Rastislav - STOLÁRIKOVÁ, Katarína. On global space powers. In Aeronautica XV : proceedings of the international conference, Lublin, Poland, October 15th-16th, 2015. 1. vyd. - Lublin : Lublin University of Technology, Faculty of Management, 2015. ISBN 978-83-7947-149-2, s. 122-133.