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Work supported in part by the U.S. Department of Energy under Contract EY-76-C-03-0511.
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Tuan, S.F. Remarks on the psion and upsilon systems. Lett. Nuovo Cimento 25, 69–72 (1979). https://doi.org/10.1007/BF02776264
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DOI: https://doi.org/10.1007/BF02776264