References
A. T. Fomenko and D. B. Fuks, A Course in Homotopic Topology [in Russian], Nauka, Moscow (1989).
Additional information
Rubtsovsk. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 38, No. 5, pp. 1106–1109, September–October, 1997.
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Nikonorov, Y.G. Inscribed balls and the lyusternik-shnirel'man category. Sib Math J 38, 957–959 (1997). https://doi.org/10.1007/BF02673039
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DOI: https://doi.org/10.1007/BF02673039