@article{MZ_1968__103_170899,
     author = {Emery Thomas},
     title = {Vector {Fields} on {Low} {Dimensional} {Manifolds.}},
     journal = {Mathematische Zeitschrift},
     pages = {85--93},
     publisher = {mathdoc},
     volume = {103},
     year = {1968},
     zbl = {0162.55403},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__103_170899/}
}