TY - JOUR AU - Kaushik Mitra AU - Carl Williams AU - Carlos Sa de Melo C2 - Physical Review Letters DA - 2008-10-16 14:10:14 LA - en PB - Physical Review Letters PY - 2008 TI - Vortices, Antivortices and Superfluid Shells Separating Mott-Insulating Regions ER -