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Singularities of spherical surface in R4

Open Mathematics
In this article, we mainly study the geometric properties of spherical surface of a curve on a hypersurface Σ\Sigma in four-dimensional Euclidean space.
Liu Haiming, Hua Yuefeng, Li Wanzhen
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A non-homogeneous, symmetric contact projective structure

Open Mathematics, 2014
Zalabová Lenka
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On characterization of Poisson and Jacobi structures

Open Mathematics, 2003
Grabowski Janusz, Urbański Paweŀ
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