  We present a many body analysis of the multi-band Kondo lattice model. The
study is then combined with the first principles TB-LMTO band structure
calculations, in order to investigate the temperature dependent correlation
effects in the 3$\textit{p}$ valence bands of the ferromagnetic semiconductor
EuS. Some of the physical properties of interest like the quasi-particle
density of states (Q-DOS), spectral density (SD) and quasi-particle band
structure (Q-BS) are calculated and discussed. Therewith, we propose a spin
resolved ARPES of the valence bands of EuS to be performed.
