@article{DAN_1963_152_4_a19,
     author = {H. Zieschang},
     title = {On the classification of simple systems of paths on a surface of genus~$2$},
     journal = {Doklady Akademii Nauk},
     pages = {841--844},
     publisher = {mathdoc},
     volume = {152},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a19/}
}