@article{CMH_1961__35_139210,
     author = {Nicolaas H. Kuiper},
     title = {Convex {Immersions} of {Closed} {Surfaces} in {E3.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {85--92},
     publisher = {mathdoc},
     volume = {35},
     year = {1961},
     zbl = {0243.53043},
     url = {http://geodesic.mathdoc.fr/item/CMH_1961__35_139210/}
}