An adaptive filter for the PLANCK Compact Source Catalogue construction
  We develop a linear algorithm for extracting extragalactic point sources for the Compact Source Catalogue of the upcoming PLANCK mission. This algorithm is based on a simple top-hat filter in the harmonic domain with an adaptive filtering range which does not require a priori knowledge of the CMB power spectrum and the experiment parameters such as the beam size and shape nor pixel noise level. 
L.-Y. Chiang, H.E. Jorgensen, I.P. Naselsky, P.D. Naselsky, I.D.   Novikov and P.R. Christensen