Guseynov, Sharif E., and Janis S. Rimshans. “ON THE GINZBURG-FEINBERG PROBLEM OF FREQUENCY ELECTROMAGNETIC SOUNDING FOR UNAMBIGUOUS DETERMINATION OF THE ELECTRON DENSITY IN THE IONOSPHERE”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 15, 2017): 89–96. Accessed November 21, 2024. https://journals23.rta.lv/index.php/ETR/article/view/2561.