Geodesic
Closed surfaces
Matematičeskie zametki, Tome 5 (1969) no. 6, pp. 719-721 
K. M. Belov. Closed surfaces. Matematičeskie zametki, Tome 5 (1969) no. 6, pp. 719-721. http://geodesic.mathdoc.fr/item/MZM_1969_5_6_a8/
@article{MZM_1969_5_6_a8,
     author = {K. M. Belov},
     title = {Closed surfaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {719--721},
     year = {1969},
     volume = {5},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_6_a8/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is established that closed surfaces of genus zero do not permit non-trivial deformation with retention of the mean curvature. There are four items in the Literature Cited.