Analysis of Freja charging events: charging events identification and case study / J.-E.Wahlund,L.J.Wedin,A.I.Eriksson и др., 1999. - 92 p. - Текст : непосредственный.
Analysis of Freja charging events : Modelling of Freja observations by spacecraft charging codes / A.I.Eriksson,L.Wedin,J.-E.Wahlund,B.Holback, 1999. - 137 p. - Текст : непосредственный.