BOJILOVA, R.; MUKHTAROV, P. Preliminary Results of Methodology for Forecasting the Minimum Virtual Height of Ionospheric F-Region for Sofia City. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 76, n. 12, p. 1860–1867, 2023. DOI: 10.7546/CRABS.2023.12.08. Disponível em: https://www.proceedings.bas.bg/index.php/cr/article/view/440. Acesso em: 19 apr. 2025.