A.F. Yakovets, A. Jahanshir, G.I. Gordienko, B.T. Zhumabayev, Yu.G. Litvinov и N. Abdrakhmanov 2019. STATISTICS OF VARIATION RANGE OF F2- LAYER MAXIMUM HEIGHT OF THE IONOSPHERE. Academic Scientific Journal of Computer Science. 4 (авг. 2019), 129–134.