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Supported by DFG-contract Ba 2259–5 and Ja 5223–1
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Hoh, W. Some commutator estimates for pseudo differential operators with negative definite functions as symbols. Integr equ oper theory 17, 46–53 (1993). https://doi.org/10.1007/BF01322545
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DOI: https://doi.org/10.1007/BF01322545