TY - JOUR AU - Ryu, Changhyun AU - Andersen, Mikkel AU - Clade, Pierre AU - Natarajan, Vasant AU - Helmerson, Kristian AU - Phillips, William D. C2 - Physical Review Letters DA - 2008-10-16 14:10:14 LA - en PB - Physical Review Letters PY - 2008 TI - Observation of Persistent Flow of a Bose-Einstein Condensate in a Toroidal Trap ER -