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Received: 15 January 2001; in final form: 8 April 2001/Published online: 27 June 2002
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Dong, Y. On energy gap of unitons. Math Z 240, 677–688 (2002). https://doi.org/10.1007/s00209-002-0344-7
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DOI: https://doi.org/10.1007/s00209-002-0344-7