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Dedicated to Professor Dr. Erhard Heinz on the occasion of his 65th birthday
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Simader, C.G. An elementary proof of Harnack’s inequality for Schrödinger operators and related topics. Math Z 203, 129–152 (1990). https://doi.org/10.1007/BF02570727
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DOI: https://doi.org/10.1007/BF02570727