Found the following. I leave the comment to the experts.
http://infoscience.epfl.ch/record/108833/files/
Y. Wiaux, P. Vielva, R.B. Barreiro, E. MartÃnez-González and P. Vandergheynst, Non-Gaussianity analysis on local morphological measures of WMAP data, Mon. Not. R. Astron. Soc., Vol. 385...