Srećković, Vladimir A., Desanka M. Šulić, Veljko Vujčić, Darko Jevremović, and Yaroslav Vyklyuk. “THE EFFECTS OF SOLAR ACTIVITY: ELECTRONS IN THE TERRESTRIAL LOWER IONOSPHERE”. Journal of the Geographical Institute “Jovan Cvijić” SASA 67, no. 3 (December 23, 2017): 221–233. Accessed May 2, 2024. https://ojs.gi.sanu.ac.rs/index.php/zbornik/article/view/48.