  Statistical overdensities of radio sources in the NRAO VLA Sky Survey (NVSS)
catalogue have proven to be signposts to high-redshift clusters of galaxies. A
similar search for overdensities has been carried out in the Sydney University
Molonglo Sky Survey (SUMSS), which is closely matched in resolution and
frequency to the NVSS. Sixty potential southern-hemisphere clusters have been
found in SUMSS.
