References
S. M. Ulam, A Collection of Mathematical Problems [Russian translation], Nauka, Moscow (1964).
L. A. Lyusternik and V. I. Sobolev, Elements of Functional Analysis [in Russian], Nauka, Moscow (1965).
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Translated from Sibirskii Matematicheskii, Vol. 35, No. 3, pp. 644–646, May–June, 1994.
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Nikonorov, Y.G. A homotopic analog of Helly's theorem and the existence of quasi-invariant points. Sib Math J 35, 577–579 (1994). https://doi.org/10.1007/BF02104823
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DOI: https://doi.org/10.1007/BF02104823