@article{IM_1984__77_143152,
     author = {H.B., Jr Lawson and M.-L. Michelsohn},
     title = {Embedding and surrounding with positive mean curvature.},
     journal = {Inventiones mathematicae},
     pages = {399--420},
     year = {1984},
     volume = {77},
     zbl = {0555.53027},
     url = {http://geodesic.mathdoc.fr/item/IM_1984__77_143152/}
}