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Dedicated to Professor Dr. Rolf Rei\ig on the occasion of his 65th birthday
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Haussmann, W., Zeller, K. H-Sets and Best Uniform Approximation by Solutions of Elliptic Differential Equations. Results. Math. 14, 84–92 (1988). https://doi.org/10.1007/BF03323218
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DOI: https://doi.org/10.1007/BF03323218