Introduction Elements of Dispersion Relation Technique for Two-Body Scattering Reactions Spectral Integral Equation for the Decay of a Spinless Particle Into a Three-Body State Non-Relativistic Three-Body Amplitude Propagators of Spin Particles and Relativistic Spectral Integral Equations for Three-Hadron Systems D-Matrix Method and Partial Wave Analysis of the Meson - Nucleon and Photo - Production Data Reggeon-Exchange Technique for the Description of the Reactions of Two-Meson Diffractive Production. Analysis of Reactions Pi N Two Mesons + N Diquarks and Reduction of Baryon States Conclusions.
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