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Letter, J. Marcure->A.P. Ershov, 26.09.1985
Information, 26.09.1985
Letter (hand-written), B. Levrat->A.P. Ershov, 21.10.1985
Letter, A.P. Ershov->B. Levrat, 18.11.1985
Working Notes, 15.11.1985
Review, 12.12.1985
Letter with attachment, K. van Schouten->A.P. Ershov, 01.08.1986
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