BIMA observations of possible microwave background sources
  We present sensitive upper limits on the 90 GHz flux of known radio and infrared sources in regions associated with possible cosmic microwave background fluctuations at 0.5--1 degree scales. Specifically we look at the MAX GUM region and the region of strongest fluctuation in the MSAM scan. None of the known sources can account for the levels of anisotropy seen. 
Lawrence M. Chernin & Douglas Scott