Geodesic
An Analog of the Sauer Theorem
Matematičeskie zametki, Tome 74 (2003) no. 3, pp. 463-470 
V. T. Fomenko. An Analog of the Sauer Theorem. Matematičeskie zametki, Tome 74 (2003) no. 3, pp. 463-470. http://geodesic.mathdoc.fr/item/MZM_2003_74_3_a14/
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     author = {V. T. Fomenko},
     title = {An {Analog} of the {Sauer} {Theorem}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {463--470},
     year = {2003},
     volume = {74},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2003_74_3_a14/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper, we present an analog of the Sauer theorem for projectively equivalent surfaces in the class of infinitely small equiareal deformations that pointwise preserve the spherical image of the surface.

[1] Sauer R., “Infinitesimale Verbiegungen zueinander projektiver Flächen”, Math. Ann., 3 (1935)

[2] Kagan V. F., Teoriya poverkhnostei, T. I, OGIZ, M., 1947

[3] Vekua I. N., Obobschennye analiticheskie funktsii, Fizmatgiz, M., 1959