  Partial wave amplitudes for production and decay of baryon resonances are
constructed in the framework of the operator expansion method. The approach is
fully relativistically invariant and allow us to perform combined analyses of
different reactions imposing directly analyticity and unitarity constraints.
All formulas are given explicitly in the form used by the Crystal Barrel
collaboration in the (partly forthcoming) analyses of the electro-, photo- and
pion induced meson production data.
