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The technique of functional integration over velocities is applied to thecalculation of the propagator of a spinning particle with and without anomalousmagnetic moment. A representation for the spin factor is obtained in thiscontext for the particle in a constant electromagnetic field. As a by-product,we also obtain a Schwinger representation for the first case.Comment: latex, 19 page

Functional integral over velocities for a spinning particle with and without anomalous magnetic moment in a constant electromagnetic field