@article{CMUC_2002_43_2_a8,
     author = {Yampolsky, A.},
     title = {On the intrinsic geometry of a unit vector field},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {299--317},
     year = {2002},
     volume = {43},
     number = {2},
     mrnumber = {1922129},
     zbl = {1090.54013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2002_43_2_a8/}
}