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Furusho, Y., Takaŝi, K. A supersolution-subsolution method for nonlinear biharmonic equations in \(\mathbb{R}^N \) . Czechoslovak Mathematical Journal 47, 749–768 (1997). https://doi.org/10.1023/A:1022830920903
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DOI: https://doi.org/10.1023/A:1022830920903