TY - JOUR AU - P Engels AU - I Coddington AU - P Haljan AU - V Schweikhard AU - Eric Cornell C2 - Physical Review Letters DA - 2003-01-01 00:01:00 LA - en M1 - 90 PB - Physical Review Letters PY - 2003 TI - Observation of long-lived vortex aggregates in rapidly rotating Bose-Einstein condensates ER -