TY - JOUR AU - Deborah Jin AU - J. Ensher AU - M. Matthews AU - Carl Wieman AU - Eric Cornell BT - Physical Review Letters DA - 1996-01 DO - 10.1103/PhysRevLett.77.420 PY - 1996 SP - 420 EP - 423 T2 - Physical Review Letters TI - Collective Excitations of a Bose-Einstein Condensate in a Dilute Gas VL - 77 SN - 0031-9007 ER -