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Dedicated to Professor Otto Haupt with best wishes on his 100th birthday.
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Leutwiler, H. Best constants in the Harnack inequality for the Weinstein equation. Aeq. Math. 34, 304–315 (1987). https://doi.org/10.1007/BF01830680
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DOI: https://doi.org/10.1007/BF01830680