Sushchenko, Olga A., Elisabeth O. Yermakova, and Irina V. Osipenko. “REVIEW OF THE MODERN NAVIGATION SYSTEMS AND FUTURE TRENDS OF THEIR DEVELOPMENT”. Proceedings of National Aviation University 35, no. 2 (February 1, 2008): 18–22. Accessed May 5, 2024. https://jrnl.nau.edu.ua/index.php/visnik/article/view/1560.