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Additional information
Dnepropetrovsk State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 32, No. 3, pp. 360–372, September, 1977.
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Vladimirov, S.A. Symmetry groups of field equations for spin 1/2. Theor Math Phys 32, 794–803 (1977). https://doi.org/10.1007/BF01089563
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DOI: https://doi.org/10.1007/BF01089563