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Work supported by National Science Council.
On leave from Physics Department, Taiwan University, Taiwan, R.O.C.
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Chang, K.L. Topological charges of fields with cross gauge symmetry. Lett. Nuovo Cimento 32, 395–400 (1981). https://doi.org/10.1007/BF02745134
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DOI: https://doi.org/10.1007/BF02745134