@article{DAN_1976_229_6_a9,
     author = {\`E. R. Rozendorn},
     title = {A smooth singular arc on a surface of constant negative curvature},
     journal = {Doklady Akademii Nauk},
     pages = {1321--1323},
     publisher = {mathdoc},
     volume = {229},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_229_6_a9/}
}