Gordiyenko, G., Yakovets, A., Yakovets, A., & Litvinov, Y. (2020). LONG - TERM VARIATIONS IN THE F- AND D-REGIONS OF IONOSPHERE. Известия НАН РК. Серия физико-математическая, (3), 209–216. извлечено от http://89.250.84.46/physics-mathematics/article/view/491