%0 Journal Article %A A. V. Kostin %T Asymptotic lines on the pseudo-spherical surfaces %J Vladikavkazskij matematičeskij žurnal %D 2019 %P 16-26 %V 21 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMJ_2019_21_1_a1/ %G ru %F VMJ_2019_21_1_a1