L. A. Lyusternik, “Ideas and opinions of N. I. Lobachevskii”, Uspekhi Mat. Nauk, 1946, Volume 1, Issue 1(11),Pages <nobr>15

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Uspekhi Mat. Nauk, 1946 Volume 1, Issue 1(11), Pages 15–21 (Mi rm7011)

By the 90th anniversary of the date of death of N. I. Lobachevskii

Ideas and opinions of N. I. Lobachevskii

L. A. Lyusternik