  The dynamical mean-field theory together with the non-crossing approximation
is used to set up a novel scheme to study the electronic structure of strongly
correlated electron systems. The non-interacting band structure is obtained
from a density functional calculation within the local density approximation.
With this method the doped Mott insulator $\rm La_{1-x}Sr_x Ti O_3$ is studied.
Starting from first-principle calculations for a cubic and an orthorhombic
system we determined the one-particle spectrum. Both one-particle spectra show
a lower Hubbard band (seen as $d^1 \to d^o$ transitions in photo emission
experiments), a Kondo resonance near the Fermi energy and the upper Hubbard
band ($d^1\to d^2$ transitions in an inverse photoemission experiment). The
upper Hubbard band develops a multipeak structure, a consequence of the
consideration of all local two-particle correlations, which leads to the full
multiplet structure in the atomic limit. The calculation for the orthorhombic
system shows qualitative good agreement when compared with experimental
photoemission spectra.
