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References
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Research supported in part by NSERC.
On leave from Istituto di Fisica dell’Università, Pisa, Italia.
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Capri, A.Z., Perrari, R. Evasion of Coleman’s theorem and goldstone bosons in two dimensions. Lett. Nuovo Cimento 29, 423–428 (1980). https://doi.org/10.1007/BF02743245
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DOI: https://doi.org/10.1007/BF02743245