  The singular chain complex of the iterated loop space is expressed in terms
of the cobar construction. After that we consider the spectral sequence of the
cobar construction and calculate its first term over Z/p-coefficients and over
a field of characteristic zero. Finally we apply these results to calculate the
homology of the iterated loop spaces of the stunted real and complex projective
spaces. In the Appendix, written by F.Sergeraert there are considered computer
methods for calculations of the homology of iterated loop spaces.
