N. V. Efimov, “N. F. Chetverukhin, Introduction to highest geometry”, Uspekhi Mat. Nauk, 1936, Issue 2,Pages <nobr>300

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Uspekhi Mat. Nauk, 1936 Issue 2, Pages 300–301 (Mi rm8899)

Bibliography

N. F. Chetverukhin, Introduction to highest geometry

N. V. Efimov