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| 4 | Geometry, Topology and Physics, M. Nakahara,Taylor & Francis; 2. Edition (June 4, 2003) |
| 5 | Schaum's Outline of Tensor Calculus , D. Kay, McGraw-Hill; First Edition (January 21, 2011) |
| 6 | Mathematical Physics, S. Hassani, Springer 1st Edition, 1991. |
| 7 | Curvature and Homology, S. I. Goldberg Dover Pub. (1970) |