Kovaleva G A

Publications in Math-Net.Ru

1. Non-existence of closed asymptotic curves on the tubes of negative Gaussian curvature with one-to-one spherical mapping
   
   Fundam. Prikl. Mat., 1:4 (1995),  953–977
2. Example of a surface that is homotopic to a tube and has a closed asymptotic line
   
   Mat. Zametki, 3:4 (1968),  403–413