TY - JOUR AU - Kulin, S AU - Killian, T AU - Bergeson, S AU - Rolston, S C2 - Physical Review Letters DA - 2000-07-01 LA - en M1 - 85 No. 2 PB - Physical Review Letters PY - 2000 TI - Plasma Oscillations and Expansion of an Ultracold Neutral Plasma ER -