Some consequences of unitarity and crossing existence and asymptotic theorems.- Analyticity, unitarity and crossing-symmetry constraints for pion-pion partial wave amplitudes.- New methods in the analysis of ?-N scattering.- Regge-pole phenomenology.- Certain problems of two-body reactions with spin.- Duality and regge theory.- Complex angular momentum.- An introduction to dual resonance models in multiparticle physics.- Physical N-pion functions.- Application of harmonic analysis to inelastic electron-proton scattering.- Small-distance behaviour in field theory.- Physics on the light cone.- Course on padé approximants.