TY - JOUR AU - I. Coddington AU - P. Engels AU - V. Schweikhard AU - Eric Cornell BT - Physical Review Letters DA - 2003-09 DO - 10.1103/PhysRevLett.91.100402 PY - 2003 T2 - Physical Review Letters TI - Observation of Tkachenko Oscillations in Rapidly Rotating Bose-Einstein Condensates VL - 91 SN - 0031-9007 ER -