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Work supported in part by the U.S. Department ol Energy under Contract EY-76-C-03-0511.
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Okada, J., Tuan, S.F. Unconfined heavy-fermion model of the upsilons?. Lett. Nuovo Cimento 26, 33–37 (1979). https://doi.org/10.1007/BF02746570
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DOI: https://doi.org/10.1007/BF02746570