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Additional information
A. M. Gertsen State Pedagogic Institute, Leningrad. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 21, No. 6, November–December, 1980.
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Kantor, B.E. Nonexistence of closed asymptotic lines on a class of tubes with negative curvature. Sib Math J 21, 768–773 (1980). https://doi.org/10.1007/BF00968463
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DOI: https://doi.org/10.1007/BF00968463