Ulysses observations of open and closed magnetic field lines within a coronal mass ejection - Bothmer,V; Desai,MI; Marsden,RG; Sanderson,TR; Trattner,KJ; Wenzel,KP; Gosling,JT; Balogh,A; Forsyth,RJ; Goldstein,BE (ASTRONOMY & ASTROPHYSICS, 1996)