@article{IM_1984__77_143153,
     author = {H.B., Jr Lawson and M.-L. Michelsohn},
     title = {Approximation by positive mean curvature immersions: frizzing.},
     journal = {Inventiones mathematicae},
     pages = {421--426},
     publisher = {mathdoc},
     volume = {77},
     year = {1984},
     url = {http://geodesic.mathdoc.fr/item/IM_1984__77_143153/}
}