The spin structure of the qq interaction and the mass spectra of bound systems: different versions of the 3-dimensional reductions of the Bethe-Salpeter equation

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Bound q\bar q -systems are considered in the framework of three different versions of the 3-dimensional reduction of the Bethe-Salpeter equation, all having the correct one-body limit when one of the constituent quark masses tends to infinity, and in the framework of the Salpeter equation. The spin structure of confining qq interaction potential is taken in the form x\gamma_{1}^{0}\gamma_{2}^{0}+(1-x)I_{1}I_{2}, with 0 \leq x \leq 1. The problem of existence (nonexistence) of stable solutions of 3-dimensional relativistic equations for bound q\bar q systems is studied for different values of x from this interval. Some other aspects of this problem are discussed.