E. S. Lyapin, L. N. Shevrin, “International Symposium on Semigroup Theory”, Uspekhi Mat. Nauk, 1969, Volume 24, Issue 3(147),Pages <nobr>237

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Uspekhi Mat. Nauk, 1969 Volume 24, Issue 3(147), Pages 237–239 (Mi rm5510)

Mathematical Events in the USSR and abroad

International Symposium on Semigroup Theory

E. S. Lyapin, L. N. Shevrin