Geodesic
An Analog of the Sauer Theorem
Matematičeskie zametki, Tome 74 (2003) no. 3, pp. 463-470.

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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. 
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     author = {V. T. Fomenko},
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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/

[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