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This work was supported in part by the U.S. Atomic Energy Commission.
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Bierter, W., Morrison, H.L. Microscopic derivation of the low-lying excitation spectrum of an interacting bose system. Lettere Nuovo Cimento (1969-1970) 1, 701–704 (1969). https://doi.org/10.1007/BF02752573
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DOI: https://doi.org/10.1007/BF02752573