References
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- Differential geometry and symmetric spaces S.Helgason
- Foundations of differential gometry Kobayashi;K.Nomizu
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- book Sifert Manifolds K.B.Lee;F.Raymond
- Die Grundlehren der Math. v.114 Homology Mac Lane;Saunders
- Math.Ann. v.233 The group of isometries of a left invariant Riemannian metric on a Lie group T.Ochiai;T.Takahashi
- Spaces of constant curvature J.A.Wolf