| Letter, 18.03.1978 Request to submit proposals on collaboration on subject 1.8.6. by 22 March 1978
Covering letter, H. Maier->G. I. Marchuk, 04.07.1978to the information materials on the subject "International conputing center networks in selected directions in socialist countries" (copies in Russian and German )
Letter, H. Maier->A.P. Ershov, 10.04.1980Information about the conference INFO-81 with invitation to submit a paper
Letter, P. Bachmann->A.P. Ershov, 10.03.1979
Letter, G. I. Marchuk->N. S. Egorov, 31.01.1968
Conclusion, A.P. Ershov->N. N. Bogolyubov..., 10.11.1971
Letter, V. P. Kochergin->V. V. Pazelskiy, 11.05.1970
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