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Prescriptions for constructing covariant propagators from the Singh-Hagen Lagrangian are presented. Propagators are derived explicitly for spin J≤5 (J an integer) according to this prescription. They agree with the propagators proposed by Harnad and Snoke in connection with the O(4) propagator. They do not depend on arbitrary parameters contained in the free Lagrangian. Some comments on daughter fields associated with contact-interaction fields are given.
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Kobayashi et al. (1975) studied this question.
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