@article{88116, author = {V Schweikhard and S Tung and Eric Cornell}, title = {Vortex proliferation in the Berezinskii-Kosterlitz-Thouless regime on a two-dimensional lattice of Bose-Einstein condensates}, year = {2007}, number = {99}, month = {2007-01-01}, publisher = {Physical Review Letters}, language = {en}, }