Joint observations by Cluster satellites of bursty bulk flows in the magnetotail - Cao,JB; Ma,YD; Parks,G; Reme,H; Dandouras,I; Nakamura,R; Zhang,TL; Zong,Q; Lucek,E; Carr,CM; Liu,ZX; Zhou,GC (JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2006)