The Vieira et al. 2010 catalog is available here.
These papers describe the statistics of the point sources found in the South Pole Telescope survey, and how to pick out distant, dusty galaxies from these catalogs. Since the SPT observes simultaneously at multiple wavelengths, we can pick out objects that look like they should be dusty from this – they should be much brighter at 1.4mm than at 2mm. After cross-referencing these sources with other galaxy catalogs, we can exclude known nearby galaxies and other contaminants. If we then pick out the brightest objects from the remainder, we’re left with a population which is almost uniformly very distant and gravitationally lensed by foreground galaxies or groups/clusters of galaxies.