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A new formulation of the large-component reduction method for one- and two-particle relativistic wave equations is presented and compared with the reduction procedure by the method of successive canonical transformations. Sufficient conditions are given for the identity, to the order (1/c)², of the energy spectra obtained by the two methods. The "contact interaction" term resulting from the latter procedure is shown to arise in the former as well, contrary to a statement by Wu and Tauber.
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Glover et al. (1956) studied this question.
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