@article{10_4153_CMB_1991_014_1,
     author = {Noakes, J. L.},
     title = {Generalised {Umbilics} on {Embedded} {Spheres}},
     journal = {Canadian mathematical bulletin},
     pages = {90--95},
     year = {1991},
     volume = {34},
     number = {1},
     doi = {10.4153/CMB-1991-014-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-014-1/}
}