KOUBA, D., BOŠKA, J., GALKIN, I. A., SANTOLÍK, O., ŠAULI, P. Ionospheric drift measurements: Skymap points selection. Radio Science. 2008, 43(1), RS1S90/1-RS1S90/11. ISSN 0048-6604. E-ISSN 1944-799X. Dostupné z: https://doi.org/10.1029/2007RS003633.