TY - JOUR AU - Pierre Clade AU - Changhyun Ryu AU - Anand Ramanathan AU - Kristian Helmerson AU - William Phillips C2 - Physical Review Letters DA - 2009-05-01 00:05:00 LA - en M1 - 102 PB - Physical Review Letters PY - 2009 TI - Observation of a 2D Bose-gas: from thermal to fractured quasi-condensate to superfluid ER -