sea ($\overline qq$). Operationally the baryon sector of the model is solved in two steps. In the first step, motivated by the large $N_c$ limit, a static localized solution (soliton) is found. It is done by solving the equations of motion in an iterative selfconsistent procedure assuming that the $\sigma$ and $\vec\pi$ fields have hedgehog structure. However, this hedgehog soliton does not preserve the spin and isospin. In order to describe the nucleon properties one needs nucleon states with the proper spin and isospin numbers. To this end the classical solution is semiclassically quantized making use of the rotational zero modes. In fact, such a cranking procedure was elaborated in \[\]. Recently, within this scheme including Dirac sea polarization effects quite successful calculations for the nucleon moment of inertia \[\], magnetic moments \[\] and nucleon electric form factors \[\] have been reported.

There are several reasons that the model described by () is considered as one of the most promising effective theories describing low energy QCD phenomena. First, the model is the simplest quark model which provides mechanism for spontaneous breaking of the chiral symmetry — the very basic feature of QCD. The mesons appear as excited states of quark-antiquark 