  This talk is a natural continuation of that given by V.Vereshagin at this
conference. We discuss some details not covered in that talk and review the
calculational technique using the (\pi N)-elastic scattering as an example.
Finally, we briefly mention some results of numerical comparison with
experimental data. More technical details can be found in the talk by
K.Semenov-Tian-Shansky (this conference)devoted to the analysis of elastic KN
scattering.
