An empirical model of ionospheric total electron content (TEC) near the crest of the equatorial ionization anomaly (EIA) oleh Hajra Rajkumar, Chakraborty Shyamal Kumar, Tsurutani Bruce T., DasGupta Ashish, Echer Ezequiel, Brum Christiano G.M., Gonzalez Walter D., Sobral José Humberto Andrade