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This work has been partially supported by the Istituto Nazionale di Fisica Nucleare.
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Parravicini, G., Sparzani, A. & Pauri, M. Poincaré invariance and manifestly covariant equations. Lettere Nuovo Cimento (1969-1970) 1, 295–301 (1969). https://doi.org/10.1007/BF02752509
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DOI: https://doi.org/10.1007/BF02752509