@article{MS2_1969__25_166100,
     author = {Heiner Zieschang},
     title = {Algorithmen f\"ur einfache {Kurven} auf {Fl\"achen} {II.}},
     journal = {Mathematica Scandinavica},
     pages = {49--58},
     publisher = {mathdoc},
     volume = {25},
     year = {1969},
     zbl = {0175.50102},
     url = {http://geodesic.mathdoc.fr/item/MS2_1969__25_166100/}
}