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This work has been done during a visit of the first author at the University of Göttingen.
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Akcoglu, M.A., Krengel, U. A differentiation theorem for additive processes. Math Z 163, 199–210 (1978). https://doi.org/10.1007/BF01214067
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DOI: https://doi.org/10.1007/BF01214067