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Research supported by the Science Fund of Academia Sinica.
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Kungching, C., Chongwei, H. Periodic solutions for the semilinear spherical wave equation. Acta Mathematica Sinica 1, 87–97 (1985). https://doi.org/10.1007/BF02560007
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DOI: https://doi.org/10.1007/BF02560007