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Documents associated with Technical University of Dresden Letter with attachment, 27.12.1967 Letter, N. J. Lehmann->A.P. Ershov, 25.06.1971 Letter, N. J. Lehmann->A.P. Ershov, 01.10.1975 Thanks for the invitation to the Symposium, which proved to be very interesing; sends the paper manuscript corrected according to Springer publishing rules
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