Letter, B. Lorho->A.P. Ershov, 22.09.1975
Letter, Kees Koster->A.P. Ershov, 23.09.1975More thanks for warm receipt in Akademgorodok; questions about the manuscript for the Symposium Proceedings
Letter, N. J. Lehmann->A.P. Ershov, 01.10.1975Thanks 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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