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Supported in part by the National Research Council of Canada.
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Logan, R.K., Roy, D.P. Duality and nonet degeneracy. Lettere Nuovo Cimento (1969-1970) 3, 517–520 (1970). https://doi.org/10.1007/BF02911581
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DOI: https://doi.org/10.1007/BF02911581