TY - JOUR AU - V Schweikhard AU - S Tung AU - Eric Cornell C2 - Physical Review Letters DA - 2007-01-01 LA - en M1 - 99 PB - Physical Review Letters PY - 2007 TI - Vortex proliferation in the Berezinskii-Kosterlitz-Thouless regime on a two-dimensional lattice of Bose-Einstein condensates ER -