%0 Journal Article %A È. R. Rozendorn %T A smooth singular arc on a surface of constant negative curvature %J Doklady Akademii Nauk %D 1976 %P 1321-1323 %V 229 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1976_229_6_a9/ %G ru %F DAN_1976_229_6_a9