Nina, A., V. M. Čadež, J. Bajčetić, M. Andrić, and G. Jovanović. “RESPONSES OF THE IONOSPHERIC D-REGION TO PERIODIC AND TRANSIENT VARIATIONS OF THE IONIZING SOLAR Lyα RADIATION”. Journal of the Geographical Institute “Jovan Cvijić” SASA, vol. 67, no. 3, Dec. 2017, pp. 235–248, doi:10.2298/IJGI1703235N.