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In this work consideration is given to massless and massive gauge-invariantspin 0 and spin 1 fields (particles) within the scope of a theory of thegeneralized relativistic wave equations with an extended set of the Lorentzgroup representations. The results obtained may be useful as regards theapplication of a relativistic wave-equation theory in modern field models.

Massless and Massive Gauge-Invariant Fields in the Theory of Relativistic Wave Equations