Nina, A. et al. 2017. 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. 67, 3 (Dec. 2017), 235–248. DOI:https://doi.org/10.2298/IJGI1703235N.