  The map-making process of Cosmic Microwave Background data involves linear
inversion problems which cannot be performed by a brute force approach for the
large timelines of most modern experiments. We present optimal iterative
map-making methods, both COBE and Wiener, and apply these methods on simulated
data. They produce very well restored maps, by removing nearly completely the
correlated noise that appears as intense stripes on the simply pixel-averaged
maps.
